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the law of segregation states that genes have alternative forms, or alleles. in a diploid organism, the two alleles of a gene separate during meiosis and gamete formation; each sperm or egg carries only one allele of each pair.
This law explains the 3:1 ratio of the f2 phenotypes observed when monohybrids self-pollinate. each organism inherits one allele for each gene from each parent. in heterozygous individuals, the two alleles are different, and expression of the dominant allele masks the law of independent assortment states that the pair of alleles for a given gene segregates into gametes independently of the pair of alleles for any other gene. this law explains the 9:3:3:1 ratio of the f2 phenotypes in a cross between dihybrids.
It is also known as the first inheritance legislation. According to the law of segregation,
When gametes are developing, "the two copies of each genetic factor separate, ensuring that each parent's offspring attains one factor." Or
Each gene is segregated during the gamete's development such that the gamete only has one allele of that gene.
When a person makes gametes, the copies of a gene are separated so that each gamete can only accept one copy. A gamete only receives one allele.
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apes what is the likely response of the island vegetaion after the elimation of the invasive european rabbits
Wild rabbits harm vegetation, compete with local species, and ruin the environment. By devouring seeds and seedlings, they ringbark shrubs and trees and stop regeneration.
Rabbits frequently have a greater influence during times of drought and right after a fire, while food is scarce and they have to consume whatever they can.Additionally, phosphine and carbon monoxide are employed to fumigate burrows & kill any rabbits that may be present. It appears that spreading viruses into the wild is the best and most economical strategy to reduce the population of European rabbits. Native fauna and flora are directly harmed by rabbit damage and competition for food and shelter. They destroy vegetation through their burrowing and browsing, which can cause soil erosion and slope instability. Additionally, because of their excessive grazing habits, which frequently cause soil erosion and decreased water quality, rabbits compete with native species for food and habitat. The first step in managing an invasive species is recognising rabbit activities on your property.
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using the table, distinguish between the production of atp, use of oxygen and release of co2 in aerobic cell respiration between the cytoplasm and the mitochondrion
Following points are difference between the production of ATP, use of oxygen and release of CO₂ in aerobic cell respiration between the cytoplasm and the mitochondrion.
Cytoplasm-ATP production - 2-4 molecules
Mitochondria-ATP production - 32-34 molecules
Cytoplasm-use of oxygen - not require
Mitochondria - use of oxygen - required
Cytoplasm-release of CO₂ - produced
Mitochondria-release of CO₂ - removal of CO₂
What are the differences between aerobic and anaerobic respiration in terms of ATP production?Anaerobic respiration uses much less energy than aerobic respiration. Up to 38 ATP are produced by aerobic processes for every glucose. Only 2 ATP are produced by anaerobic processes for every glucose.
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Compare and contrast ELISA and western blotting (immunoblotting) by moving the phrases to the technique that they describe. If a phrase describes both ELISA and western blotting, move it to the \"Both\" bin.
Patients having an ELISA antibody-positive result are offered a Western Blot test as a secondary verification.
A secondary verification test using a Western Blot is administered to patients who have an ELISA result that is antibody-positive because it checks for more antibodies and is less likely to be misconstrued. Enzyme-Linked Immuno-Sorbet Assay is referred to as ELISA. It is a test used to determine whether any proteins, including antibodies, hormones, and enzymes, are present. The substance at hand can also be measured. Antigens are present in the body, and the presence of such proteins is proof of that. Another laboratory technique for determining the presence of proteins is the Western Blot. It makes use of the gel electrophoresis method. This method can also be used to isolate proteins.
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Cellular differentiation progressively restricts cell fate because the unexpressed genes in the cell:a. become more densely packed with nucleosomes.b. accumulate point mutations.c. accumulate deletions.d. accumulate both point mutations and deletions.e. undergo increasing repression.
Cellular differentiation progressively restricts cell fate because the unexpressed genes in the cell undergo increasing repression.
What do you mean by repression?
Repression is a psychological defense mechanism whereby a person unconsciously blocks unacceptable thoughts, feelings, and memories from their awareness. It can involve the denial or suppression of desires and impulses, or even the distortion or transformation of such desires into more acceptable forms. Repression is a defense mechanism that is used to keep potentially threatening or uncomfortable information out of conscious awareness.
Cellular differentiation is the process by which a single cell divides, resulting in two or more specialized cells that have different functions. As this process occurs, the cell's gene expression profile changes, with some genes becoming more active and others becoming increasingly repressed. This is done in order to ensure that the cell will be able to specialize in performing certain tasks and that it will not become confused and perform the wrong function. As the cell's gene expression profile changes, the number of genes that are expressed reduces, restricting the range of functions the cell can perform. This increasing repression of genes restricts the cell's fate and ensures it will specialize in performing a specific task.
Hence, the correct option is E.
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Explain how genetics and environment influence the similarities and differences within twins
The differences between two identical twins are usually caused by the environment and their similarities is as a result of them possessing the the same types of genes.
What is a Gene?
This consists of DNA strands and it is referred to as the basic unit of heredity which is passed from parent to child during reproduction.
Envrironmental factors and upbringing shape an individual and is the reason why it is responsible for the differences which are exhibited. However twins have the same type of genes as they are formed from the same egg and is therefore the reason why they are similar in diverse forms.
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the haber process is used to create ammonia as an industry standard. in order to create the largest amount of product possible, they allow the reaction to come to equilibrium and then cool the reaction quickly. use your knowledge of intermolecular forces to explain why this is deemed the best way to proceed with the reaction.
The Haber process is run at a high temperature and then quickly cooled in order to optimize ammonia output. As a result, the ammonia gas is trapped in the liquid phase, where there is less chance that it may decompose.
A force that attracts the protons or the positive components of one molecule to the electrons or negative components of another molecule is known as an intermolecular force.
The equilibrium constant rises when the Haber process is carried out at high temperatures. This is because the heat energy makes the reactants more reactive by helping to break their bonds. However, the ammonia gas also has a tendency to break down into hydrogen and nitrogen gas at high temperatures.
The Haber process heavily relies on intermolecular forces. Weak intermolecular interactions draw the hydrogen and nitrogen molecules together. These forces are overpowered at a high temperature, allowing the molecules to react to produce ammonia. The ammonia molecules are less likely to disintegrate as the temperature is reduced because the intermolecular interactions are stronger.
Therefore, explanation given above best explains why the given process is deemed the best way to proceed with the reaction.
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The speed of sound in steel is greater than it is in air because
steel is
a. more elastic than air
b. less elastic than air
c. more dense than air
d. less dense than air
The speed of sound in steel is greater than it is in air because
steel is
a. more elastic than air
b. less elastic than air
c. more dense than air
d. less dense than air
Answer:
Option A
Explanation:
The more elasticity the medium has, the more speed the sound travels. The density of steel is more than air because molecules are closer together in solids than in liquids or gas.
In general, sound waves in steel travel 17 times faster than through air. The speed of sound is determined by the dynamic propagation of sound waves. The speed of sound depends on elasticity and density and here both the elasticity and density of steel are more than air.
Hence, "The speed of sound in steel is greater than it is in the air because steel is more elastic than air".
Infants are likely to reach motor milestones at different ages depending on the culture. This is probably due to?
a. size constancy
b. affordances
c. presbyopia
d. activity opportunities
Depending on the culture, infants may develop their motor skills at a different age. Activity opportunities are probably to blame for this.
What exactly are infants?a child in their first year of life, in fant in-fnt. A person who isn't really of legal age is referred to as a baby, child, or minor.
Baby is the following?Newborns (ages 0–4 weeks); infants (ages 1–12 months); toddlers (ages 1-2 years); preschoolers (ages 2–6 years); education children (ages 6–12 years); and adolescents (ages 12–18 years) are some instances of defined intervals and age-related development phases (ages 12–18 years).
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all of the trident maple trees, loblolly pine trees, and pawpaw trees in atlanta could be considered members of:
All of the trident maple trees, loblolly pine trees, and pawpaw trees in atlanta could be considered members of: a community and an ecosystem.
What is difference between community and ecosystem?
A community is concerned with the populations of living things and their interactions in a particular space. These are thought of as biotic or life forces. In a forest, for instance, the community would include deer, bears, grass, trees, and decomposers. Decomposing organisms include fungus and bacteria. All living things, such as fungus and plants, would be included in the forest.
Both biotic and abiotic forces are present in an ecosystem. Abiotic elements are those that are not living, such as the local climate and topography. Abiotic elements include things like the sun, rocks, and water. An ecosystem is created by the interaction of the biotic and abiotic elements.
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A fruit fly with short legs (ll) and vestigial wings (ww) is crossed with one that is heterozygous for both traits. Assuming the dominant alleles are on separate chromosomes, show the cross and the expected phenotypic proportions.
Answer:
question not to clear and what the meaning of chromosome
Fruit fly research by Thomas Hunt Morgan revealed that some crosses weren't producing the desired results. A typical cross used to show linkage groups is a recessive mutant crossed with a heterozygote wild type with vestigial wings and a black body.
This is how the cross would appear.
vg+ vg bl+ bl x vg vg bl bl
Additional research verified that alleles shared by the same chromosomes are inherited collectively. Although the result will always be 1:1 if there hasn't been any crossing over, Thomas Hunt Morgan didn't find this to be the case. The fruit fly's chromosomes were mapped. Depending on the features they are related with, alleles are classified as either dominant or recessive. A phenotypic ratio is a numerical comparison of two phenotypes that demonstrates how frequently the occurrence of one trait corresponds with another.Human cells have two copies of each gene because they have two copies of each chromosome. Alleles can be recessive or dominant. Chromosome segregation is the process by which two sister chromatids, or paired homologous chromosomes, created as a result of DNA replication, separate from one another and move to the opposing poles of the nucleus in eukaryotes.
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Consider a major environmental change. If there are no organisms in a population that have traits that allow them to continue to reproduce and survive, what would most likely happen to that population?
which of the following best describes how ribosomes will interact with other organelles within a cell? (1 point)
Which of the following best describes how ribosomes will interact with other organelles within a cell?
a) They will break down other organelles by secreting digestive enzymes.
b) They will provide energy to other organelles through cellular respiration.
c) They will store waste products that are produced by other organelles.
d) They will synthesize proteins that can become components or other organelles.
Option d; They will synthesize proteins that can become components or other organelles.
Ribosomes are organelles that play a crucial role in protein synthesis. They are composed of RNA and protein, and are found in both prokaryotic and eukaryotic cells. They read the genetic code on messenger RNA and use it to build a chain of amino acids, which then fold into a functional protein. Ribosomes are found in the cytoplasm of cells, and can exist as a single unit or in groups called polyribosomes .Ribosomes are responsible for the synthesis of proteins within cells. They read the genetic code on messenger RNA (mRNA) molecules and use it to build a chain of amino acids.
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neurons are stimulated olfactory receptors detect vaporized odor molecules signal forwarded to cerebral cortex for interpretation nerve impulse travels to the olfactory bulb in the brain
The stages in detecting a smell should be taken in the following order:
Olfactory receptors detect the presence of vaporized odor molecules.Neurons are triggered A nerve impulse passes to the brain's olfactory bulb. The signal is sent to the cerebral cortex for interpretation.Sensory neurons in the nose generate this neural code. When an odorant molecule attaches to a receptor, an electrical signal is generated, which travels from sensory neurons to the olfactory bulb. The olfactory bulb is a structure at the forebrain's base that sends messages to other brain areas for processing.
The olfactory epithelium contains olfactory receptors. This is a specific region of the nasal mucosa in the upper nasal cavity that covers part of the ethmoid bone. The reticular formation regulates the state of awareness as well as the cardiovascular and respiratory systems. On its journey to the thalamus, the ascending sensory system travels via the brainstem.
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The time between meals when the body is performing catabolic reactions in order to maintain blood glucose levels a) Lipolysis b) Gluconeogenesis c) Glycogenolysis d) Glycogenolysis e) Glycolysis f) Fed-state g) Fasted-state h) Glycogenesis
when a person goes without eating and their body engages in catabolic processes to keep their blood sugar levels Fed-state.
What is the term used to describe the Fed condition that follows eating a meal?Following a meal, as your body digests and assimilates the nutrients, you are in the absorptive state, also known as the fed state. As soon as food enters your mouth, it begins to be broken down into its component elements for absorption through the intestines.
After eating a meal, what is the main mechanism by which insulin is released?Foods with carbs are broken down during digestion into glucose. A rise in blood glucose levels results from the majority of this glucose being injected into your bloodstream.
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Horned lizards are desert animals that are active during the day. Their skin and kidneys are efficient at conserving water, when they get hot, they move to the shade so they can cool off. This describes__adaptation to the hot and dry desert. -anatomical-behavioral-physiological--behavioral and physiological-anatomical, behavioral, and physiological
Desert animals known as horned lizards are active during day. They go to the shade to cool off when they grow hot because its skin and kidney are good at storing water. The morphological, behavioral, physiological, and behavioral adaptations to the hot, dry desert are described here.
What types of adaptations are physiological?Examples of biological adaptation include the tanning of skin from prolonged sun exposure, the development of callous on hands from repetitive pressure or contact, and the capacity for some species to absorb nutrients in low oxygen environments.
What are some illustrations of behavioral and physical adaptations?Animals' physical adaptations enable them to live in their surroundings. Examples include mimicry and camouflage. Animals can modify their behavior to meet their demands. Examples of this migration, instinct, acquired behavior, and hibernation.
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out of the dozens of groups listed here, only some have an above replacement fertility (2.06), namely roma (2.620), tabasarans (2.327), turks (2.236), avars (2.166), dargins (2.158), altaians (2.154), tajiks (2.141) and kumyks (2.066).
Boys have historically outnumbered girls at birth, with 105 boys born for every 100 females. As a result, after accounting for all of these variables, the replacement level fertility is 2.1.
In general, when the TFR is larger than 2.1, the population in a particular area will rise, and when it is less than 2.1, the population in a given area will eventually decline, but this process may take some time because age structure, emigration, and immigration must all be taken into account. A total fertility rate of 2.1 children per woman guarantees a largely stable population under the assumption of no net migration and constant mortality. Fertility is a factor in population increase, reflecting both the causes and effects of societal and economic changes, along with death and migration.
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which of the following genera are known for producing spores? streptococcus staphylococcus corynebacterium bacillus all of the above
Endospore-forming bacteria have a wide range of genetic variation, with more than 25 genera now recognised. However, low G+C Gram-positive bacteria, such as those in the genera Bacillus and Clostridium, are virtually entirely responsible for the formation of endospores.
What is an endospore ?It enables the bacterium to create a latent and incredibly resilient cell to protect the cell's genetic material under extremely stressful conditions. Endospores are able to withstand environmental stresses that would typically kill the bacterium.
What species of bacteria make endospores?Nevertheless, low G+C Gram-positive bacteria, such as those belonging to the genera Bacillus, Clostridium, Thermoactinomyces, Sporolactobacillus, as well as Sporosarcina, produce practically all of the endospores.
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which of the following genera are known for producing spores?
A. streptococcus
B. staphylococcus
C. corynebacterium bacillus
B. all of the above
The net-energy ratio is the ratio between the useful energy present in a type of fuel, and the energy used to
extract and process that fuel.
a. TRUE
b. FALSE
The net-energy ratio measures the relationship between a fuel's usable energy and the energy required to produce it.
What connection exists between energy resources and net energy?
Thermodynamic efficiency is the quantity of usable energy that remains from a supply after the energy required to make that energy available has been subtracted. When the energy resource's easy reserves have been depleted, the resource's energy cost rises.
What is the energy intake to useful work ratio?
The percentage of work input which is converted to job output, or the useful production of renewable to total electricity input ratio, is the machine's efficiency. By multiplying by 100, you can convert efficiency to percent by 100%. A machine with 100% efficiency would be perfect.
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The net-energy ratio measures the relationship between a fuel's usable energy and the energy required to produce it.
What connection exists between energy resources and net energy?Thermodynamic efficiency is the quantity of usable energy that remains from a supply after the energy required to make that energy available has been subtracted. When the energy resource's easy reserves have been depleted, the resource's energy cost rises.
What is the energy intake to useful work ratio?The percentage of work input which is converted to job output, or the useful production of renewable to total electricity input ratio, is the machine's efficiency. By multiplying by 100, you can convert efficiency to percent by 100%. A machine with 100% efficiency would be perfect.
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Which of the following adaptations has allowed aquatic plants and animals to survive in a terrestrial environment? O greater structural support O the ability to acquire resources O methods to allow movement O the ability to photosynthesize the ability to use oxygen during respiration
Among the following adaptations greater structural support has allowed aquatic plants and animals to persist in a terrestrial environment.
What is the connection between aquatic and terrestial ecosystems?Aquatic and terrestrial ecosystems are linked by the movement of matter and nutrients along the habitat boundaries through the emergence of aquatic insects. Emergent aquatic insects change trophic relationships and ecosystem productivity by the input of nutrients through insect carcasses.
Is frog terrestial or aquatic animal?In general, frogs have bluging eyes, no tail, and webbed hind feet. These adaptations are for swimming and leaping. They also have smooth and moist skins. Many are primarily aquatic, but some live on land also, sometimes are also found in burrows, or in trees. They are basically counted in amphibians.
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jill is homozygous recessive for gene a and is going to have a child with jack, who is heterozygous for gene a. which of the following offspring genotypes could not result from fertilization of a normal haploid egg with a sperm that had undergone nondisjunction in meiosis ii (assume no crossing over)?
Aaa and a is the following offspring genotypes could result from fertilization of a normal haploid sperm with an egg that had undergone nondisjunction in meiosis I
On the other hand, meiosis serves a single function in the human body—that of producing gametes, or sex cells such as sperm and eggs. Making daughter cells with exactly half as many chromosomes as the original cell is its main objective.To put it another way, meiosis is the process by which human cells divide from diploid ones with two sets of chromosomes to haploid ones with one set. Sperm and eggs are the haploid cells produced during meiosis in humans. The two haploid sets of chromosomes combine to produce a complete diploid set, or a new genome, when a sperm and an egg fertilize each other. An organism's genotype is made up of all of its genetic components.The alleles or variations that an individual possesses in a certain gene or genetic region are also referred to as the genotype.
complete question:Jill is heterozygous for gene A and is going to have a child with Jack, who is homozygous recessive for gene A. Which of the following offspring genotypes could result from fertilization of a normal haploid sperm with an egg that had undergone nondisjunction in meiosis I?
1. AAa
2. Aaa
3. aaa
4. Aa
5. aa
6. a
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Explain why COVID is not classified like the cells it infects
Answer:
Cause COVID is caused by a virus called Novel corona virus and it affects directly our nervous and respiratory system not a particular cell.
which are the distinct characteristics of the neotenic (species that retain larval traits) amphibian species?
Neotenic amphibian species retain certain larval traits in their adult forms, such as retaining gills and not undergoing metamorphosis.
Some examples of neotenic amphibians include axolotls and mud puppies. They are also typically smaller and have a more simplified body structure compared to their fully metamorphosed counterparts. Additionally, neotenic amphibians often exhibit delayed reproduction, with adults remaining sexually immature until later in life. They also tend to have a different habitat from other amphibians, often living in aquatic environments and not venturing on land.
Some other characteristics of neotenic amphibians include:
They often have an elongated body shape, with a tail that is longer than in fully metamorphosed amphibians.They may have a more limited range of movement, with some species being unable to move on land.They often have a more streamlined body shape, which is better adapted to an aquatic lifestyle.To know more about neotenic, click here,
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50 points!! exploring models of enzyme reactions
A catalyst is a substance that accelerates a chemical process without undergoing any changes as a result of the reaction. The enzyme galactose is one such substance. The two monosaccharides that make up lactose—galactose and glucose—are joined by a bond, and lactase works as a catalyst to dissolve that link.
What is an enzyme's straightforward definition?A biological catalyst called an enzyme is usually always a protein. It accelerates a certain chemical process in the cell. The enzyme is employed repeatedly and is not degraded during in the reaction.
What are the principal 3 enzymes?In the mouth or pancreas, amylase is produced and breaks down complex carbs. The pancreatic enzyme lipase breaks down lipids. The pancreas produces protease, which breaks down proteins.
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fill in the blank. krebs cycle _____ enters the cycle and then combines with _____ to make the six-carbon compound citric acid. this compound then undergoes several reactions which release _____ as waste, _____ and _____ to move onto the next stage of respiration, and energy in the form of _____. a single glucose molecule releases _____ molecules of atp, _____ molecules of nadh, and molecules of fadh2 because two molecules of _____ are created from each molecule of _____ .
During Krebs cycle, Acetyl-CoA enters the cycle and then combines with oxaloacetate to make the six-carbon compound citric acid. this compound then undergoes several reactions which release CO₂ as waste, NADH and FADH₂ to move onto the next stage of respiration, and energy in the form of ATP. A single glucose molecule releases two molecules of ATP, two molecules of NADH, and molecules of FADH₂ because two molecules of pyruvate are created from each molecule of glucose .
The citric acid cycle (CAC), often referred to as the Krebs cycle, is a set of chemical processes that oxidizes acetyl-CoA, which is produced from carbs, lipids, and proteins, to release stored energy. Instead of fermenting, organisms that respire use the Krebs cycle to produce energy, whether through anaerobic or aerobic respiration. The cycle also supplies precursors of certain amino acids and NADH, a reducing agent that is employed in a variety of other processes. It was likely one of the oldest elements of metabolism and may have come about abiogenically given its prominent role in numerous metabolic processes.
Despite being referred to as a "cycle," it is not essential for metabolites to travel along a single path; at least three more stages of the citric acid cycle have been identified.
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Why are bubbles and precipitates both signs of a chemical change
The bubbles are evidence that a gas has been produced and production of a gas is a sign of a chemical reaction.
Why is a precipitation reaction a chemical change?The two clear, colorless liquids coming together causes a chemical shift because a new solid is created. Inform pupils that a precipitate is an insoluble solid that develops as a result of the chemical reaction between two liquids. Insoluble refers to a solid's inability to dissolve.Numerous findings suggest a chemical reaction has taken place. Precipitate formation is one of them. A solid that is distinct from any of the reactants is referred to as a precipitate.Precipitate production is one of the indicators of a chemical reaction. Precipitate refers to the end result of a reaction between two liquids when a solid is produced.Learn more about precipitation refer to :
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Kendall plants flower seeds and places caterpillar larvae in a sealed container with enough light, soil, moisture, and gases to thrive. When she opens the container after 5 days, she finds that the flowers have sprouted, and caterpillars have eaten some of their leaves. If it was possible to measure the carbon content of every part of this closed container before and after Kendall performed her experiment, what would Kendall find? a The total amount of carbon increased B. The total amount of carbon decreased. C. The total amount of carbon was constant throughout the experiment. D. The total amount of carbon decreased before and increased after the flowers sprouted.
If it was possible to measure the carbon content of every part of this closed container before and after Kendall performed her experiment, Kendall would find out that the total amount of carbon decreased which is denoted as option B.
What is Photosynthesis?
This is defined as the process in which green plants manufacture their food in the presence of sunlight using carbon dioxide and water.
Since we are ware that the plant sprouted and it is made up of carbon molecules then the caterpillars eating some of their leaves means that there will be a likely decrease in the carbon content therebh making it the correct choice.
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the selective transport into bacterial cells makes it essentially non-toxic for mitochondrial 70s ribosomes.
Tetracycline selectively transport into bacterial cells makes it essentially non toxic for mitochondrial 70s ribosome.
Tetracyclines, which include tigecycline, doxycycline, and tetracycline, are a class of drugs used to manage and treat different bacterial infections. Antibiotics known as broad-spectrum tetracyclines are classified as protein synthesis inhibitors.
Infections can be treated with tetracyclines, and they can also assist to manage acne. According on your doctor's assessment, demeclocycline, doxycycline, and minocycline may also be utilized for further issues. Tetracyclines are ineffective against the common cold, the flu, or other viral diseases.
Tetracyclines impede the aminoacyl-ability tRNA's to attach to the acceptor site on the mRNA-ribosome complex by reversibly binding to the 30S ribosomal subunit once they have entered the cell. The result is a bacteriostatic effect due to the inhibition of protein synthesis.
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identify three macromolecules that are components of the plasma membrane in a eukaryotic cell and discuss the structure and function of each. (6 points maximum; 1 point for each macromolecule + structure, 1 point for each macromolecule + functions)
1. Phospholipids: Structure: Phospholipids are composed of a glycerol backbone, two fatty acid tails, and a phosphate group.
Function: Phospholipids form the basic structure of a cell membrane, creating a barrier between the inside and outside of a cell.
2. Cholesterol: Structure: Cholesterol is a waxy sterol molecule with a hydrophilic head and a hydrophobic tail.
Function: Cholesterol helps to stabilize the membrane by maintaining the fluidity of the cell membrane when conditions change.
3. Proteins: Structure: Proteins are composed of amino acids that are connected together in a chain.
Function: Proteins act as receptors on the surface of the membrane, allowing for communication and transport of molecules into and out of the cell.
What is amino acids?
Amino acids are organic molecules that contain an amino group (-NH2) and a carboxyl group (-COOH). They are the building blocks of proteins. There are 20 different types of amino acids, each of which contains a different side chain group (R group).
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in the context of science, how would you classify the following statement? dinosaurs became extinct because a large asteroid collided with earth.
Dinosaurs became extinct because a large asteroid collided with earth. The answer is Hypothesis.
What is meant by asteroid ?
One of the smaller planets in the inner Solar System is an asteroid. Asteroids are stony, metallic, or ice worlds without an atmosphere, with sizes and forms ranging from 1-meter pebbles to a dwarf planet with a diameter of over 1000 km.In the past, asteroid observations have been made from Earth; however, the Galileo spacecraft made the first near study of an asteroid.NASA and JAXA subsequently launched a number of asteroids-focused missions, and other missions are being planned.While Dawn investigated Vesta and Ceres, NASA's NEAR Shoemaker studied Eros. Itokawa and Ryugu samples were investigated by the JAXA missions Hayabusa and Hayabusa2, respectively, and returned.Bennu was examined by OSIRIS-REx, which took a sample in 2020 and will return it to Earth in 2023.To learn more about asteroid refer to
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Metaphase of meiosis 1 and meiosis 2 differ in that...
a. chromosomes line up at the equator
b. homologues line up in meiosis I and duplicated chromosomes line up in meiosis 2
c. sister chromatids line up in meiosis 1 and chromosomes line up in meiosis 2
d. there are the same number of chromosomes
Answer:
b. homologues line up in meiosis I and duplicated chromosomes line up in meiosis 2
Explanation:
During meiosis I, homologous chromosomes (one from each parent) line up at the equator, also known as the metaphase plate. This is called synapsis, and it ensures that each of the resulting daughter cells receives one copy of each chromosome. During meiosis II, the chromosomes that have already been separated during meiosis I, line up at the equator and the sister chromatids are separated into the daughter cells.
Meiosis I and meiosis II both have the same number of chromosomes in the daughter cells but the difference is that in meiosis I the homologous chromosomes are separated and in meiosis II sister chromatids are separated.
