Answer:
Bubbles and precipitates are both signs of a chemical change because they both indicate that a new substance has been formed.
Explanation:
Bubbles and precipitates are both signs of a chemical change because they both indicate that a new substance has been formed.
Bubbles are formed when a gas is produced as a result of a chemical reaction. The formation of bubbles is a sign that a chemical change has occurred, as a new substance, the gas, has been created.
Precipitates, on the other hand, are solid particles that form when two or more liquids are mixed and a chemical reaction occurs. The formation of a precipitate is also a sign that a chemical change has occurred, as a new substance has been formed. The precipitate can be seen as a solid material that is visibly different from the original substances that were mixed.
In summary, both bubbles and precipitates are physical evidence that a chemical change has occurred because they both indicate that a new substance has been formed through a chemical reaction.
which of these are cellular activities that sustain a single-celled organism through its lifetime? select all that apply. A.The transmission of DNA to offspringB.Processes by which individuals produce offspringC.Increases in cell size and volume
A single-celled microorganism, also known as a 'unicellular' microorganism, is a microscopic organism made up of only one cell. Unicellular microorganisms reproduce asexually to produce offspring.
The cellular activities that keep a single-celled organism alive include:
DNA transmission to offspringIndividuals produce offspring through various processes.Cell size and volume increase1. Prokaryotic bacteria, unicellular fungi (e.g., yeast), and unicellular protists are examples of unicellular microorganisms (e.g., Amoeba).
2. The process by which organisms transmit their genetic material (DNA) to offspring is referred to as reproduction.
3. Asexual reproduction occurs in unicellular organisms (without the involvement of gamete formation).
4. Unicellular organisms grow in size and volume throughout their lives to perform metabolic functions.
5. Finally, unicellular organisms share cellular activities such as DNA transmission to offspring, processes by which individuals produce offspring, and cell size and volume increase.
Learn more about " single-celled organism " to visit here;
https://brainly.com/question/29188904
#SPJ4
subject science
make a story about sexual reproductive of flowering plants like the gumamela flower with title
Answer:
Title: The Reproductive Journey of the Gumamela Flower
Deep in the heart of a lush tropical forest, a beautiful gumamela flower bloomed. As the sun beat down on the delicate petals, the flower began its journey of reproduction. First, the male reproductive parts, called stamens, released pollen grains into the air. These grains were carried by the wind to the female reproductive parts, called the pistil, of another gumamela flower.
As the pollen grains landed on the pistil, they began to grow a tube down to the ovules, the female reproductive cells. The tube carried the male reproductive cells, called the sperm, to the ovules, where fertilization occurred. As a result, a seed was formed, which would eventually grow into a new gumamela plant.
Thus, the gumamela flower, like all flowering plants, relies on the wind to carry its pollen to other flowers for fertilization and the continuation of its species.
Which of the following is an example of human impact on the carbon cycle?
a. The increased production of methane gases from cattle farms
b. The burning of fossil fuels
c. The cutting down of trees for lumber
d. Driving automobiles
e. All of the above
All of the above examples of human impact on the carbon cycle, The increased production of methane gases from cattle farms, burning of fossil fuels cutting down of trees, and driving automobiles.
How do humans impact the carbon cycle?Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels, changing land use, and the production of concrete with limestone.
Carbon dioxide, a greenhouse gas, is released into the atmosphere in massive quantities when fossil fuels are burned.
Therefore, global warming is caused by greenhouse gases, which trap heat in our atmosphere. Already, there has been a 1C rise in the average world temperature.
Learn more about carbon, here:
https://brainly.com/question/1627609
#SPJ1
Describe in 1-2 complete sentences how the motor commands from the CNS would travel to the effector target organ or tissue. Tell if the motor command will travel via the somatic or autonomic nervous system; explain why.
Motor commands can be either somatic or autonomic, somatic are voluntary and innervate skeletal muscles. While autonomic are involuntary and innervate smooth muscle, cardiac muscle, and glands.
What is muscle function?Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction.
Why are muscles important?Healthy muscles let you move freely and keep your body strong. They help you to enjoy playing sports, dancing, walking the dog, swimming, and other fun activities. And they help you do those other (not so fun) things that you have to do, like making the bed, vacuuming the carpet, or mowing the lawn.
To know more about muscle visit
https://brainly.com/question/2937599
#SPJ4
The helper T cell is active when....
It has engulfed a pathogen
It has learned the shape of the antigen
It has made the MHC protein
T cells undergo a clonal expansion and differentiation followed by a contraction phase, once the pathogen has been cleared.
How does the T cell respond to a pathogen?Recent in vitro and in vivo evidence supports an antigen-pre-senting role for T cells. Human T cells exhibit major histocompatibility complex (MHC) class II antigens and adhesion molecules that are typical of antigen-presenting cells (APCs).
Controlling the populations of effector, memory, and naive T lymphocytes depends on cell survival and death. The presence of MHC proteins in the antigen-presenting cell is necessary for the identification process because they bind to these fragments, transport them to the cell surface, and present them to the T cells there together with a co-stimulatory signal.
Due to their dual specificity, T cells can distinguish between peptide antigens presented by self-MHC I or MHC II molecules and those presented by other MHC molecules.
To learn more about T cell refer to :
https://brainly.com/question/9875046
#SPJ1
Complete the statements below by choosing the correct
part of the neuron from the drop-down menus.
Information enters the neuron through structure
Information passes through structure to reach
structure
Information leaves the neuron through structure
A
B
С
D
E
Information enters the neuron through structure A (dendrites).
Information passes through structure B (the cell body or soma)Information leaves the neuron through structure C (the axon)What is the neuron about?In a neuron, the dendrites are the structures that receive incoming signals from other neurons. These signals are then processed by the cell body or soma, which is the part of the neuron that contains the nucleus and other organelles.
Therefore, The processed signals then travel along the axon, which is the long, thin extension of the neuron that carries the signals to the next neuron or to the target cell. The signals are then passed on to the next neuron or target cell through specialized structures called synapses.
Learn more about neuron from
https://brainly.com/question/13061744
#SPJ1
Some bacteria are metabolically active in hot springs because A) high temperatures make catalysis unnecessary B) their enzymes are completely insensitive to temperature. 9 they are able to maintain a lower internal temperature. D) their enzymes have high optimal temperatures.
Some bacteria can sustain a lower internal temperature, which allows them to be metabolically active in hot springs. Their enzymes operate best at high temperatures.
Which of the following claims regarding a metabolic pathway's feedback regulation is true?
The right response is (b) The product of the pathway inhibits its own synthesis by inhibiting an enzyme's ability to bind a substrate to its active site through competitive inhibition.
Why do T cells not often use heat to remove the activation energy required for processes to take place?
Proteins, DNA, and RNA are examples of significant macromolecules that store a lot of energy and break down exothermically. The fundamental elements of these exothermic processes may overcome their activation barriers if cellular temperatures alone provided enough heat energy for them to.
To know more about bacteria visit:
brainly.com/question/8008968
#SPJ4
What is Metamerism in prosthodontics?
The matching of the apparent colours of objects with various spectral power distributions is known as "metamerism."
Why does metamerism exist?When two colours seem to match in one lighting scenario but not in another, this phenomenon is known as metamerism. Metameric matching are fairly frequent, especially in colours that are close to being neutral, such as grey, white, and dark hues.The matching of the apparent colours of objects with various spectral power distributions is known as "metamerism." Or, to put it another way, when items of varying materials or composition appear to be different under one light source but the same under another. This is the difficulty with shade matching, as it is sometimes referred as.Variations in pigments, dyes, or materials are the major culprits behind this phenomena.To learn more about Metamerism refer to:
https://brainly.com/question/12122720
#SPJ4
TRUE OR FALSE terrestrial zones are characterized by the vegetation type while aquatic zones are characterized by their physical environment.
It is TRUE that aquatic zones are distinguished by their physical environment, whereas terrestrial zones are distinguished by the type of plant they support.
Two main categories—terrestrial and aquatic—are used to classify the biomes of the planet. Aquatic biomes encompass both freshwater and ocean biomes, whereas terrestrial biomes are based on land. Temperature and precipitation patterns that are specific to each of the eight primary terrestrial biomes on Earth help to identify them. Abiotic factors play a significant role in the distribution of biomes, as seen by comparisons between yearly precipitation totals and variations in precipitation from one biome to another. Daily and seasonal temperature variations are crucial for determining the biome's vegetation type and predicting the biome's geographic distribution. These biomes are distributed in a way that demonstrates how one biome can exist in two geographically different regions with comparable climatic conditions.
To know more about Abiotic factors
brainly.com/question/29773665
#SPJ4
define the following words that were included in today's lesson: inorganic, organic, compound, glucose
inorganic compound, these are the compound which do not have carbon - hydrogen bond. Examples could be of carbon dioxide, salt which is sodium and chloride.
It has ionic bond between metals and nonmetals.
They are soluble in water, conductive, high melting and boiling point.
organic compound, it has both carbon and hydrogen and makes up living.
It includes carbohydrates, protein, fats etc.
made up of covalent bonds.
it is not soluble in water, hace low boiling and melting point and is non conductive.
Glucose, is a major sugar comes under carbohydrate which means it is an organic molecule.
it has the molecular formula of C6H1206, energy source of living.
Broken down during respiration for ATP.
To know more about glucose,
https://brainly.com/question/8394646
#SPJ4
neurons from all over the cerebral cortex send axons to the brainstem and spinal cord. considering what you know about how the telencephalon develops into the mature brain, which of the following describes a possible path that an axon could take from the occipital cortex to the pons?
Directly from the telencephalon to the diencephalon, followed by the midbrain, the pons, and lastly the hindbrain. The pons is the location where the cerebellum gathers all information entering or leaving it.
The cerebral cortex, limbic forebrain regions, basal ganglia, and olfactory system are the four main parts of the telencephalon. The cerebral cortex, basal ganglia, hippocampal formation, amygdala, and olfactory bulb all originate from the telencephalon. For instance, sensory neurons deliver information to the brain from the skin, nose, ears, mouth, and eyes. From the brain, motor neurons send signals to the rest of the body. The area of the developing brain closest to the front is called the telencephalon. It develops from the prosencephalon along with the diencephalon.
To learn more about telencephalon click here https://brainly.com/question/29256928
#SPJ4
Crossing over plays a critical role in increasing the genetic variation among offspring of sexual reproduction. It is important to understand how crossing over occurs and its consequences in meiosis. Look carefully at the diagrams depicting different stages in meiosis in a cell where
2n=6
. Assume that the red chromosomes are of maternal origin and the blue chromosomes are of paternal origin. Drag the name of the appropriate stage of meiosis to the target above each diagram. Then, in the target of 2 below each diagram, specify whether the event of crossing over is possible or impossible/unlikely during this phase of meiosis. Note that the diagrams are in no particular order
When two gametes eventually unite during sexual reproduction, a process known as crossing over produces gametes that contain new gene combinations, maximising the genetic variety of every offspring that emerges.
How does meiotic crossing over boost genetic diversity?Homologous chromosomes (one from each parent) pair along their lengths during meiosis. Chiasma points are where the chromosomes cross. The chromosomes split and reassemble at each chiasma, swapping some of their genes.
What is the advantage of transitioning during meiosis?Meiotic crossing over ensures that homologous chromosomes are segregated correctly and produces genotypic diversity. Despite these roles, little is known about the genetic and population genetic mechanisms that contributed to the development of species-specific variations in recombination rates.
To know more about gametes visit:-
https://brainly.com/question/29882202
#SPJ4
imagine a couple that is ready to start a family. they plan to have exactly four children. assuming no multiple births (twins, triplets, etc.), use the information provided in pascal's triangle (figure 2.15) to determine how many different ways they may have exactly three boys and one girl.
Four ,The one girl can be the first, second, third, or fourth child, by use the information provided in pascal's triangle.
What is the name for multiple births?If you are expecting more than one child at once, you are said to be pregnants multiple births. Twins are two infants that you are carrying at the same time. Triplets are three children delivered inside one pregnancy. Additionally, you can bear numerous infants at once (high-order multiples).Usually, when more than one egg is fertilised, several pregnancies result. It can also occur when a fertilised egg divides into two or more embryos, each of which develops into a baby. Identical twins are the offspring produced when a single fertilised egg divides into two.To learn more about pascal's triangle refer to:
https://brainly.com/question/24180309
#SPJ4
The temperature in Delhi falls to even 5°C in winter and may go up to 45°C
during summer but our body temperature remains at 37°C. How do we make it
possible?
The way we make it possible is that The human body is able to maintain a constant internal temperature, known as homeostasis, through a number of physiological mechanisms. One of the main ways the body regulates its temperature is through the process of thermoregulation.
What is body temperature about?The hypothalamus, a small region in the brain, acts as the body's thermostat. It continually monitors the body's temperature and sends signals to other parts of the body to make adjustments as needed.
When the body is too warm, the hypothalamus sends signals to the sweat glands to release sweat, which cools the body as it evaporates. It also sends signals to the blood vessels in the skin to dilate, allowing more blood to flow near the surface of the skin, which also helps to dissipate heat.
Thus, When the body is too cold, the hypothalamus sends signals to the muscles to contract, generating heat through the process of muscle metabolism. It also sends signals to the blood vessels in the skin to constrict, reducing blood flow near the surface of the skin and conserving heat.
Learn more about temperature from
https://brainly.com/question/29307674
#SPJ1
the researcher calucated a map distance of 17 map units. which of the information is correct about the testcoss porgeny
Gray-bodied, normal-winged flies plus black-bodied, vestigial-winged flies = 17% of t he total is the correct statement about the testcross progeny. Thus, the correct option is option A.
What is testcross?A test cross is a cross between an individual with an unknown genotype and another individual with a homozygous recessive genotype. A test cross identifies or reveals the original person's genotype. A test cross can help determine whether a dominant phenotype is homozygous or heterozygous for a trait.
A test cross is a genetic technique developed by Gregor Mendel that involves mating an individual with all phenotypically recessive individuals in order to determine the zygosity of the former by analysing the proportions of offspring phenotypes. There are two types of zygosity: homozygous and heterozygous. Individuals who are heterozygous have one dominant allele and one recessive allele.
Individuals who are homozygous for both dominant and recessive alleles have two dominant alleles, whereas individuals who are homozygous for both recessive alleles have two recessive alleles.
Learn more about testcross
https://brainly.com/question/29602636
#SPJ4
Complete question:
In Drosophila melanogaster, vestigial wings are determined by a recessive allele of a gene that is linked to a gene with a recessive allele that determines black body color. T. H. Morgan crossed black-bodied, normal-winged females and gray-bodied, vestigial-winged males. The F1 were all gray bodied, normal winged. The F1 females were crossed to homozygous recessive males to produce testcross progeny. Morgan calculated the map distance to be 17 map units. Which of the following information is correct about the testcross progeny?
A) gray-bodied, normal-winged flies plus black-bodied, vestigial-winged flies = 17% of the total
B) black-bodied, vestigial-winged flies = 17% of the total
C) black-bodied, normal-winged flies plus gray-bodied, vestigial-winged flies = 17% of the total
D) black-bodied, normal-winged flies = 17% of the total
Imagine that this cleared area was made for a farm that grows only one type of crop. What kinds of outcomes might you predict for this new area of low biodiversity
The kinds of outcomes which might happen for this new area of low biodiversity represent a loss of biodiversity that might be irreversible.
What is Biodiversity?This is referred to as the variation among living organisms from different sources including terrestrial, marine ecosystems, etc.
If the cleared area was made for a farm that grows only one type of crop then it means that the biodiversity will be low and irreversible because only few species of organisms will be present as against those which can grow a lot of crops.
Read more about Biodiversity here https://brainly.com/question/26110061
#SPJ1
when the phlebotomist provides instructions for a first-morning urine specimen, which of the following statements is correct?
When the phlebotomist provides instructions for a first-morning urine specimen, he should refrigerate the specimen and bring it to the laboratory as soon as possible.
What is urine analysis?
A urine test is known as a urinalysis. It is used to identify and treat a variety of illnesses, including diabetes, renal disease, and urogenital infections. A urinalysis involves examining the colour, consistency, and composition of urine.
Learn more about urinalysis here:
https://brainly.com/question/24292109
#SPJ4
In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. When two roan cattle are crossed, the phenotypes of the progeny are found to be in the ratio of 1 red:2 roan:1 white. Which of the following crosses could produce the highest percentage of roan cattle?
A) roan x roan
B) white x roan
C) red x roan
D) red x white
E) All of the above crosses would give the same percentage of roan
Red x white is the correct answer.
Roan is a coat color that can be found on a variety of animals, including horses, cattle, antelope, cats, and dogs. It is generally defined as an even mix of white and pigmented hairs that do not "gray out" or fade as the animal ages. The colors described as "roan" in various species are produced by a variety of genetic conditions.
The Belgian Blue and Shorthorn cattle breeds are well-known for their roans. The former can have a solid black, solid white, or blue roan coat, while the latter can have a solid red, solid white, or red roan coat. Belgian Blues typically have spotting patterns that are genetically distinct from roan. As a result, the majority of roan cows have blotches of clearly colored and clearly white hair, as well as roan patches. Some "cryptic" roan cattle appear solid but reveal a small roan patch upon closer inspection.
Learn more about " roan cattle " to visit here;
https://brainly.com/question/16243744
#SPJ4
eye pigment in a particular strain of fly is determined by two genes. an autosomal gene that controls the color of the pigments in the eye has two alleles: a dominant allele (r) that results in red eyes and a recessive allele (r) that results in sepia eyes. a sex-linked gene that controls the expression of the colored pigments also has two alleles: a dominant allele (t) that allows for expression of the colored pigments and a recessive allele (t) that does not allow for expression of the colored pigments. individuals without a t allele have white eyes regardless of the alleles of other eye-color genes. which of the following represents a cross between a white-eyed female and a red-eyed male?
Two genes control eye pigment in a particular variety of flies. RrXtXt × RrXTY stands for the hybrid of a red-eyed male and a white-eyed female.
What does eye pigment mean?The quantity of pigmentation your body produces determines the color of your eyes. Your skin, hair, and eyes are all colored by a pigment called melanin. Your eye color is determined by genes. The iris comes in a complete spectrum of colors, from very light brown to extremely dark gray.
Can eye color effect how well you see?Although eye color doesn't greatly alter eyesight clarity, it can have an impact on visual comfort under specific conditions. What hues of light you see depends entirely on the quantity of the melanocytes in your iris.
To know more about eye pigment visit:
https://brainly.com/question/1699739
#SPJ4
For a given level of significance, if the sample size n is increased, the probability of a Type II error:
a. will decrease.
b. will increase.
c. will remain the same.
d. cannot be determined.
For a given level of significance, if the sample size n is increased, the probability of a Type II error a. will decrease
For a given level of significance, if the sample size n is increased, the probability of a Type II error will decrease. This is because as the sample size increases, the accuracy and precision of the sample statistics increase, and the sample becomes more representative of the population. In hypothesis testing, increasing the sample size increases the power of the test, which means the test is more likely to detect a true difference or relationship if one exists. As a result, the probability of making a Type II error (failing to reject a false null hypothesis) decreases.
To learn more about Type II error here:
https://brainly.com/question/23786929
#SPJ4
[x] body develops from two layers of embrotic tissues, not to be confused with the other body type, that includes the mesoderm, a third body layer.
how each of the following would pass through the plasma membrane: gases, large polar molecules, charged molecules (like ions), hydrophobic molecules, and small polar molecules.
Facilitated diffusion allows the crossing of large polar molecules, charged molecules (like ions), and small polar molecules, while gases hydrophobic molecules by simple diffusion.
What are the different types of diffusion?Polar and charged molecules including ions, amino acids, nucleosides, and carbohydrates can traverse the plasma membrane due to facilitated diffusion.
Simple diffusion through the cell membrane (plasma): Small, uncharged substances like oxygen and carbon dioxide as well as hydrophobic molecules like lipids can move through the cell membrane through simple diffusion due to the nature of the lipid bilayer.
Therefore, gases hydrophobic molecules cross the cell membranes by simple diffusion.
Learn more about diffusion, here:
https://brainly.com/question/1229223
#SPJ1
A stem cell continuously expresses the DIV and ID genes. Which of the following could cause this inhibition of differentiation? (Mark all that apply)
A.) The neural pathway transducer P1 acts as a phosphatase that would target transducer P2 of the skin pathway.
B.) The neural pathway transducer P2 is always phosphorylated.
C.) The neural signal is over expressed.
D.) The skin pathway receptor is not able to autophosphorylate when the skin signal is present.
A stem cell continuously depicts the DIV and ID genes. This could be caused by- The neural path transducer P2 is consistently phosphorylated and The neural signal is overexpressed
What is paracrine and autocrine signalling?Autocrine signalling is a type of signaling in which a cell secretes a hormone that hooks to the receptors on the same cell and leads to functional modifications in the cell. Paracrine signaling is a state of cell signalling in which the mark cell is close to the signal-releasing cell.
What is meant by stem cell gene expression?Gene expression studies both genome and has played an important role in enhancing our understanding. It has helped us to understand the genetic characteristics of stem cells via the identification of molecular signatures that indicate normal stem cell function.
To know more about gene, visit here:
https://brainly.com/question/8832859
#SPJ4
figure 1. a schematic drawing of three steps in translation elongation. sequential codons are numbered, and aa represents amino acid.
The conservation of the same genetic code and codon usage across all living organisms suggests common ancestry. The fact that the transformed bacteria were able to successfully translate the introduced eukaryotic mRNA provides further evidence for this common evolutionary history.
What are the three steps in translation elongation?The three steps in translation elongation are initiation, elongation, and termination.
Initiation is the first step in translation elongation. During initiation, the small subunit of the ribosome binds to the mRNA strand and scans for the start codon. Once the start codon is located, the initiator tRNA binds to the start codon and the large subunit of the ribosome binds to the small subunit, forming the complete ribosome.
Elongation is the second step in translation elongation. During elongation, the ribosome moves along the mRNA strand and translates codons into amino acids. This is done by the binding of aminoacyl-tRNA to the codon of the mRNA. The elongation step is repeated until a stop codon is reached.
Termination is the third step in translation elongation. During termination, the ribosome recognizes the stop codon and releases the newly-formed polypeptide chain from the ribosome. The ribosome then dissociates into its two subunits, and the mRNA is released from the ribosome. At this point, translation is complete and the newly-formed polypeptide chain is free to fold into its functional protein.
To learn more about translation refer to:
brainly.com/question/9734835
#SPJ4
The complete question is: A schematic drawing of three steps in translation elongation. Sequential codons are numbered, and AA represents amino acid. Referring to the figures provided, explain why the polypeptide produced when the transformed bacteria translate the introduced eukaryotic nRNA provides evidence for the common ancestry of all living organism
What physical feature would we travel through today on Day 3 of a field trip across Africa?
Kalahari Desert
Sahara Desert
Nile River
Tropic Rainforest
Kalahari desert is traveled on day 3 of the field trip across Africa. Hence, option A is correct.
What is the Kalahari desert?The 900,000 square kilometer Kalahari Desert, which also includes sections of Namibia and South Africa, is a sizable semi-arid sandy savanna in Southern Africa.
Africa's most southern desert is called the Kalahari. It is the second largest desert in Africa after the Sahara and the sixth largest desert on Earth in terms of area.
It combines with Namibia's Namib, a coastal desert, in the southwest. Hence, option A is correct.
Learn more about the Kalahari desert, here:
https://brainly.com/question/30311771
#SPJ1
Describe how oxygen gas is produced during photosynthesis include the specific structures in the plant where the reaction occurs
Oxygen gas is produced during photosynthesis with the help of the chlorophyll pigment, and the pigment is present in the chloroplast, which is the organelle, and this is present in the leaves of the plants.
What is the significance of the pigments in the chloroplast?The green plants consist of the chlorophyll that gives the leaves their green color, and these pigments, called chlorophyll, take the sun's light and then carry on the process known as photosynthesis, where oxygen is released.
Hence, oxygen gas is produced during photosynthesis with the help of the chlorophyll pigment, and the pigment is present in the chloroplast, which is the organelle, and this is present in the leaves of the plants.
Learn more about the pigments in the chloroplast here.
https://brainly.com/question/941500
#SPJ1
What illness has no commonly used vaccine? a cold b mumps c small pox d tetanus
Answer:
D. Tetanus
Explanation:
Hope it helps:)
Which four of the following characteristics are the same for bacteria and archaea?
chromosome is double-stranded DNA
presence of peptidoglycan in cell walls
type of lipid molecules found in plasma membranes
inclusions present in the cytoplasm
motility structures are present
capsules and slime layers found on most cells
70S ribosomes present in cytoplasm
How did the arrival of the arabs in northern africa influence the development of Africa?
Between the eighth and ninth centuries, Arab traders and travelers, followed by African clerics, started to spread the faith along Africa's eastern coast as well as to western and central Sudan (literally, "Land of Black People"), promoting the growth of urban areas.
How did the Arabian civilization influence Africa?Within a few decades of the prophet Muhammad's migration with his adherents from Mecca to Medina on the nearby Arabian Peninsula (622 AD/1 A.H.), Islam had already expanded into northern Africa. A few 100 years after the Prophet's death, the Arab conquest of Spain and the Arab army's advance as far as the Indus River culminated in an empire that spanned three continents. Between the eighth and ninth centuries, Arab traders and travelers, followed by African clerics, started to spread the faith along Africa's eastern coast as well as to western and central Sudan (literally, "Land of Black People"), promoting the growth of urban areas.Given its negotiated, pragmatic response to many cultural contexts, it may be more accurate to think about Islam in Africa in terms of its varied histories rather than as a single movement.First to convert were Sudanese traders, then a few kings and courtiers (Ghana in the eleventh century and Mali in the thirteenth century). However, the vast majority of rural farmers were scarcely affected. The conversion process was given a new impetus in the Ghana empire and beyond in the eleventh century by the Almoravid incursion, which was led by a band of Berber nomads who were zealous adherents of Islamic law. Islam did not spread uniformly or simultaneously across the entire African continent; rather, it did so gradually as it evolved.But for the time period under discussion, the only written records we have are from Arab sources (see, for instance, accounts by geographers al-Bakri and Ibn Battuta).To Learn more About Arab traders Refer To:
https://brainly.com/question/28571725
#SPJ1
phylogenetic analyses with systematic taxon sampling show that mitochondria branch within alphaproteobacteria
The evolutionary relationship of the mitochondrial endosymbiont to modern Alphaproteobacteria is still unclear, despite the fact that it is widely recognised that mitochondria evolved from an ancestor that resembled alphaproteobacteria.
The subject of significant discussion is whether the affinity between mitochondria and rapidly growing alphaproteobacterial lineages represents actual homology or artefacts. The effectiveness of strategies like site exclusion, which claim to reduce compositional variation between taxa at the expense of information loss, has not yet been established. Here, we show that inconsistent phylogenetic estimations of mitochondrial origin are produced by site-exclusion approaches. As a result, it is important to reevaluate earlier evolutionary ideas about mitochondria origin based on pretreatment datasets. We used various methods to reduce phylogenetic noise by systematic taxon sampling while maintaining the accuracy of site substitution data. Mitochondria were firmly positioned into the Alphaproteobacteria by cross-validation based on a number of trees, sharing a distant ancestor with Rickettsiales and currently unclassified marine lineages.
Complete question:
phylogenetic analyses with systematic taxon sampling show that mitochondria branch within alphaproteobacteria --explain
Learn more about taxa from:
https://brainly.com/question/13049459
#SPJ4
