All of the following statements are true except:_________
a) the mitotic spindles in prokaryotic cells are composed of microtubules.
b) mitosis may occur without cytokinesis.
All of the following statements are true except The mitotic spindles in prokaryotic cells composed of microtubules.
What exactly are prokaryotic cells?The earliest single-celled microbes on Earth are prokaryotic cells. Bacteria and archaea are prokaryotes. Among the prokaryotes that perform photosynthesis are cyanobacteria.. Since a prokaryotic cell only has one membrane, all processes take place in the cytoplasm.
Do prokaryotic cells contain DNA?Prokaryotic cells have their genetic material on a single circular strand of DNA that is directly in touch with the cytoplasm and bonded to the cell membrane. Since there is no enclosing membrane, there is no actual nucleus; instead, there is only a nucleoid, which is a collection of DNA.
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A scientist is testing whether light color affects plant
growth. She places three groups of plants in boxes, each
with only one color of light: red, blue, or green. She places
a fourth group of plants in natural light. Each day she
measures the plants and records their growth.
What is the dependent variable in this experiment?
A. The plants in natural light
B. The growth of the plants
C. The color of light the plants received
D. The type of plants she used
Answer:
B. The growth of the plants
Explanation:
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why do you think it is important to report threats of violence as soon as possible
Answer:
If you don't report it immediately, someone could possibly get hurt when it could've been prevented.
Explanation:
Which statement best describes acceleration?
Answer: Which statement best describes acceleration? Acceleration is the rate of change of velocity of an object.
Explanation:
The sun has blank potential energy and it transforms it into blank energy. a solar panel takes this energy and transforms it into blank. a speaker takes this energy and turns it into blank
The sun has solar potential energy, and it transforms it into light energy. a solar panel takes this energy and transforms it into electrical energy
According to the law of conservation of energy, energy can neither be created not destroyed but can transformed from one form to another.
The sun has abundance of solar energy which can be inform of light or heat energy. These energies can be converted to generate electricity through the use of PV solar panels which trapped the light energy from sun and convert it to electrical energy which can be use in our homes. This electrical energy can be used by all the electrical appliances at home which include a speaker which is used to amplify human sound, therefore the electrical energy from the solar panel is converted to the sound energy in the speaker.
A speaker takes this energy and turns it into sound energy.
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What brain centers have major roles in controlling movement, and what are these roles?
Motor cortex, basal ganglia and cerebellum are the brain centers have major roles in controlling movement.
1) motor cortex (frontal lobe, conscious control of skeletal muscle movement)
2) The basal ganglia (white matter of the brain), which aid in initiating continuous or repetitive movement
3) Cerebellum (controls rapid and complex movement)
One of the major parts of the brain involved in motor function is the primary motor cortex, or M1. The precentral gyrus, a hump in the frontal lobe of the brain, is where M1 is situated. The primary motor cortex's function is to produce the neuronal impulses that regulate how movements are carried out.The cerebellum plays a role in the synchronization and timing of motor programming. The basal ganglia are where the real motor programs are produced. The organization of motor programming for intricate motions is carried out by the basal ganglia, a group of subcortical areas. Damage to these areas causes uncontrolled, impulsive movements. The cortex and other subcortical brain regions get output from the basal ganglia.Learn more about the brain function with the help of the given link:
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A team of scientists is studying three related species of thrushes, which are a type of bird. In all three species, the thrushes feed on insects and build nests in trees. The team uses a computer simulation to predict the populations of each species in a tract of forest, both with and without the presence of other thrush species. The results are shown in the table.
Based on the computer simulations, which statement MOST likely describes an ecological relationship among the three species?
(A) All three species compete for the same niche, and species B is the strongest competitor.
(B) Species A and species C compete for the same niche, and species C is the stronger competitor.
(C) Species B fills a different niche than either species A or species C.
(D) Either species A or species C out-competes species B for its niche.
Based on the computer simulations, the statement that MOST likely describes an ecological relationship among the three species is:
Either species A or species C out-competes species B for its niche; option D.What is an ecological niche?An ecological niche is a particular place or position occupied by a species in an ecosystem.
The ecological niche of a species is where the species obtain its basic needs such as food, shelter and space.
Several species may also compete foe the same ecological niche, and the strong competitor among the species will grow and thrive in that particular niche.
Considering the results of the study when the species A, B, and C were placed in a given tract of the forest alone as well as in the presence of the other species, it can be concluded that the three species compete for the same resources and that species C is the strongest competitor.
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Homeostasis is also called_______
In which stage of Meiosis is the amount of DNA reduced? Be very specific.
During prophase I and metaphase I of meiosis, a chromosome consists of a tetrad (4 chromatids or 4 DNA molecules) and is reduced to two chromatids (2 DNA molecules) by the time metaphase II occurs.
What is meiosis?Meiosis, which generates gametes like sperm or egg cells in sexually reproducing creatures, is a unique sort of cell division since it is a reductional division. It comprises two rounds of division, producing four cells with only one copy of each chromosome as a final product (haploid). Additionally, each chromosome undergoes genetic material cross-pollination between the paternal and maternal copies before division, resulting in novel combinations of the genetic code on each chromosome. Later, during fertilization, the male and female haploid cells created by meiosis will merge to form a cell with two copies of each chromosome once more, the zygote.
Meiosis is characterized by DNA replication, two rounds of cell division, and the production of four daughter cells, each of which has half as many chromosomes as the parent cell. Meiosis I and Meiosis II are the names of the two meiotic divisions. Each chromosome's DNA is duplicated during the S phase of the cell cycle, resulting in two identical sister chromatids that are held together by sister chromatid cohesion until the start of meiosis. The terms "premeiotic S-phase" and "meiotic S-phase" might be used to describe this S-phase. Meiotic cells go through a prolonged G2-like stage known as meiotic prophase just after DNA replication. Homologous chromosomes hook together at this moment and go through genetic recombination, a predetermined process in which DNA may be cut and recombined and then repaired, which allows them to exchange some of their genetic information.
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What is the percent chance that an offspring will be produced that has normal hands?
If the hand of one parent is normal than the chance that offspring will be produced that has normal hands is 50%.
What is genetics?Genetics is considered as the branch of biology that deals with the study of genetic variation, genes, as well as heredity found in organisms. There are many types of genetics present there and these are population genetics, phylogenetics, and molecular genetics.
The character owned by parents are trasffered of passes to their offsprings and the characters are passing from one generation to next generation and this happens by the help of genes.There are many types of genetics present there and these are population genetics, phylogenetics, and molecular genetics.
Therefore, If the hand of one parent is normal than the chance that offspring will be produced that has normal hands is 50%.
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19. Eukaryotes differ from prokaryotes in that they contain a(n) ______ and ______?
A.cell membrane; a nucleus
B.nucleus; a cell membrane
C.nucleus; internal membranes(organelles)
D.cell membrane; a cell wall
Which scientist discovered that new cells only come from existing cells?
Answer:
Rudolph Virchow
I cited national geographic but brainly said that my answer included rude words even though it didn't but you can find an article on this topic at national geographic.com
Answer: GoodMorning: )✨The person who discovered that new cells only come from existing cells was - Rudolf Virchow
The third part, which asserts that cells come from preexisting cells that have multiplied, was described by Rudolf Virchow in 1858, when he stated omnis cellula e cellula (all cells come from cells).
Explanation: Robert Hooke discovered cells while working on his microscope around 1665. He observed cells in cork and has described about this in his book 'Micrographia'. Later Leeuwenhoek saw more different types of cells and bacteria. Cell theory was proposed which states cells are the units of structure and function in an organism and that cells arise from pre-existing cells. Each living cell divides into two after a definite interval of time and thus new daughter cells are produced.
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The linnaean taxonomic system classifies organisms into divisions called taxa. If two organisms belong to the same taxonomic group, they are related. Similarity at which of these levels indicates the closest relationship?.
Answer:
If two organisms belong to the same taxonomic group, they are related as Genus.
Explanation:
The Level that most closely resembles a connection?
The taxonomic level between both the family as well as the species is referred to as the genus. The genus is a collection of organisms that are closely linked and that have a variety of structural characteristics.
Given that they are members of different genera in the same family, the individuals of a gene must be more closely linked to one another.
What is a genus, for example?
Example of genus
Dogs belong to the Canis genus and are of the familiar species. Canis familiaris is the proper name for dogs in scientific terminology. Lupus is the kind of wolf found in the Canis genus. Therefore Canis lupus is indeed the proper term for wolves according to science.
Genus is the appropriate choice, therefore.
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What would be the most likely designation by the who for aml m2 by the fab classification?
Acute myeloid leukemia (AML) with t(8,21) the most likely designation by the who for aml m2 by the fab classification
Acute myeloid leukemia (AML), also known as acute myelogenous leukemia or acute nonlymphocytic leukemia (ANLL), is a cancer of the myeloid line of blood cells, characterized by the rapid growth of abnormal white blood cells that concentrated in the bone marrow and interfere with the manufacturing of normal blood cells. AML is the most common acute leukemia found in adults, and its incidence increases with age.
ML can occur by multiple mutations, chemical exposure, radiation or environmental factors.
Most symptoms direct result of lack of normal cells , Lack of red blood cells causes anaemia, resulting in fatigue and breathlessness
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A/An ___, such as NADH, carries electrons and is needed for both the Krebs Cycle and ETC.
pyruvate
organelle
coenzyme
gas
A co-enzyme such as NADH carries electrons needed for both the Krebs cycle and Electron transport chain. Thus, the correct option is C.
What is Co-enzyme?Coenzymes are the organic compounds which are required by many of the enzymes for their effective catalytic activity. Coenzymes are often vitamins, or their derivatives. Sometimes they can also act as catalysts in the absence of enzymes required for the chemical reaction, but these are not so effective as when used in conjunction with an enzyme.
While enzymes are proteins in nature, coenzymes are small, nonprotein molecules which bind to the proteins and enhance their activity. Coenzymes hold an atom or group of atoms together, allowing the enzyme to work effectively. Examples of coenzymes include vitamin B complex and S-adenosyl methionine.
Therefore, the correct option is C.
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1. Which group is made up of organisms that are most similar genetically?
O class
Oorder
O phylum
O
species
Answer:
species is the group in biology that is made up of organisms that are most similar genetically.They share very similar characteristics.
What are the two processes in meiosis that create genetic differences among cells?
The two processes in meiosis that create genetic differences among cells are independent assortment and crossing over.
Meiosis can be described as a process by which gamete cell division takes place resulting in four offsprings, each having half the number of chromosomes as the parent cell.
Crossing over and independent assortment are the two features of the process of meiosis that allow genetic diversity to occur. Through the process of crossing over, segments from the homologous chromosomes are switched. This causes a new combination of genes to occur.
It is due to the independent assortment that alleles can be inherited independently. This means that a newly formed gamete might have any allele, irrespective of any other factor, in its gamete. Alleles are sorted independently during meiosis which causes genetic diversity.
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2. Which of the following take place when we exhale? (1) Diaphragm relaxes and arches up (III) Rib cage is raised (II) Lungs expand (IV) Volume of thorax decreases
Answer: Volume of the thorax decreases
Explanation: When the lungs exhale, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out.
In the lining of the stomach are small openings called ______ that lead into tubular structures called ______.
In the lining of the stomach are small openings called gastric pits that lead into tubular structures called gastric glands.
The stomach is the organ that plays a major role in the digestion of food. The lining of the stomach contains tiny openings which are referred to as the gastric pits. Mucous columnar cells are present in the gastric pits. The gastric pits play a major role in providing an acidic environment to the stomach by aiding in the secretion of hydrochloric acid.
The gastric pits open into the tubular-shaped gastric glands. The gastric glands are actively involved in the production of mucus which protects the stomach. It also plays a major role in the secretion of digestive juices.
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Help please!
What is one pro and one con of eradicating mosquitoes?
1. The process by which a cell gets rid of wastes is known as
(1) synthesis
(2) excretion
(3) growth
(4) digestion
1. What are the free-floating spheres called that are found in each of the bacteria cells?
Answer: Ribosomes
Explanation: They are the free-floating spheres in the cytoplasm and are never attached to the membrane-bound organelle. Ribosomes are bundles of protein and genetic material that are responsible for producing all the proteins that the cell needs to live.
how quick does it take to digest a carrot
Answer:
50-60 mins
Explanation:
Answer:5 miniutes
Explanation: it depends on what type of carrot and size it is but on average it usually take me personally to eat a carrot in 5 minites
Protein, carbohydrate, and nucleic acid molecules are the result of smaller molecules bonded together. The process that occurs to attach these smaller molecules to one another is
Answer:
dehydration synthesis / condensation
Explanation:
This process removes water from the monomers so that they can bound together.
If a scientist is studying a coral reef, including both the biotic and abiotic components, what level of ecology is being studied?.
If a scientist is studying a coral reef, including both the biotic and abiotic components, then the level of ecology that is being studied is the ecosystem.
In the field of ecology, an ecosystem can be described as the interaction between all the biotic and abiotic factors of a certain place. The biotic factors are the living components of the ecosystem. The abiotic factors are the non-living components of an ecosystem.
Scientists focus on both the biotic and abiotic components of an ecosystem as both these factors are important in the maintenance of an ecosystem. A coral reef is an aquatic ecosystem, a study of its biotic components will include other aquatic life forms. A study of its abiotic factors will include water currents, salt concentration, calcium carbonate concentration, etc.
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Which organelle would play the most direct role in eliminating bacteria engulfed by a phagocytic white blood cell?.
Lysosomes play a vital role in eliminating bacteria engulfed by phagocytic white blood cells( WBCs).
Lysosomes are among the cell's organelles. It is the present cytoplasm of a cell. Golgi apparatus forms the walls of the lysosomes. Lysosome has membranous walls and it is one of the secretory vesicles.
All the waste material of the cell, organelle and large molecules such as Ribonucleic acids, Deoxy ribonucleic acid and carbohydrates can be broken down into small fragments by the enzymes released by the lysosomes. In white blood cells, lysosomes contain digest foreign particles such as bacteria and microbes.
Therefore, lysosomes play a vital role in eliminating bacteria engulfed by phagocytic white blood cells.
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What is the main function for each of these macromolecules?
Explanation:
protein - provides structural support for cells
nucleic acid - speed up reaction
carbohydrate- provides short term energy
lipid - speed up reaction
Which joins amino acids together
Answer:
peptide bonds
Explanation:
Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain.
List and describe the 4 characteristics of life.
The four characteristics of living things (life) include the following:
Living things are made up of cells.Living Things reproduce.Living Things are based on genetic code. Living things grow and develop.What are the characteristics of life?The characteristics of life are those features that are exhibited by living organisms without which they may not be able to survive in their immediate environment.
Some of the characteristics of life include the following:
Living things are made up of cells: The cell is known as the functional structural unit of life without which life is not in existence.Living Things reproduce: Living things are known to be able to produce their young ones alive. The process of reproduction prevents them from going into extinction.Living Things are based on genetic code: All living things are made up of genetic materials which are in turn transferred during reproduction to their offspring.Living things grow and develop: The cells of living things do differentiate to have specific functions and multiply into matured cells capable of reproduction.Learn more about genetic material here:
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Look carefully at the model. Plants take in the increased ground water and use the water for photosynthesis. Plants also release water into the atmosphere as a by-product of cellular respiration. What process returns the water to the water cycle (#5 in diagram)?
a
Condensation
b
Precipitation
c
Synthesis
d
Transpiration
Answer:
Transpiration
Explanation:
I study geography and biology and Water movement in plants is called Transpiration and water evaporation form plants in geography is called evapo-transpiration. Therefore, Transpiration is your answer
