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The human appendix, a vestigal extension off the large intestine, is homologous to a structure called a caecum, generally larger than our appendix, and houses bacteria that aid in digesting cellulose, the main component of plants.
Explain how the presence of the appendix might be used to show our common ancestry with other mammals, and determine what it might tell us about the dietary history of humans. Provide an example with your response.
Geneticists compare DNA base sequences among organisms and from this data determine a gene's rate of evolution. Different genes have been found to evolve at different rates. Explain why some genes might have faster rates of evolution than other genes as populations adapt to their environments, and give an example with your explanation.
ima anxious was hysterical and hyperventilating so a doctor made her breathe into a paper bag. an especially astute
A single gene controls color. When you crossed pure-breeding white-horned individuals with a pure-breeding black-horned ones, you got all gray-horned F1 offspring. You then crossed the gray-horned offspring with each other.
In Drosphila, vestigial wings (vg) are recessive to normal long wings (vg+), and the gene for this trait is autosomal. The gene for the recessive white eye trait (w) is on the X chromosome. Suppose a homozygous white, long-winged female fly is cro..
Spiny species of diatoms are found in both warm subtropical waters and colder areas. Because warm water is less dense than cold water, would you predict any differences between the spines of warm-water and cold-water individuals? Why?
The Twenty mL of water is added to the Erlenmeyer flask is to previously boiled, deionized water. Since water does absorb CO2 from atmosphere and since CO2 dissolved in water causes it to be slightly acidic,
That becomes the embryo and the new plant. Mitochondria and plastids that become chloroplasts are passed primarily from the female parent. What feature of the male or female gametophytes accounts for this
Palmitic acid is synthesized in vitro with purified substrates and fatty acid synthase. (If you use standard carbon numbering for fatty acids there is no need to draw the structure of palmitic acid in your answers).
Compare the effects of this mutation with the effects of cholera toxin.why G-protein linked receptors activate G proteins.
What is the chemical difference between the groups joined byDNA polymerase and DNA ligase?
In maize the genes Pl for purple leaves (dominant over green leaves); sm for salmon silk ( recessive for yellow silk) and py for pigmy plant (recessive to normal size) are on chromosome 6 at positions 45, 55 and 65 respectively. Predict the propor..
how many gonads does the starfish have in total? what structure in the earthworm is similar?
A common symptom of pharyngitis is swelling of the anterior cervical lymph nodes. Why may lymph nodes swell in the presence of an infection? what else may cause swollen lymph nodes? (hint: What part of the immune response causes swelling?)
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