Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What will be an ideal response?
This question asked you to analyze what would happen if Ras and SOS could not interact. If you
got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did
you think that GTP would remain bound to Ras in the absence of SOS? Did you think that Ras would
increase breakdown of GTP into GDP?
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Why do African populations of humans have higher levels of genetic variation compared to non-African populations?
A. Humans originated in Africa, and subsequent migrations resulted in populations seeded by small groups with relatively small amounts of variation. B. Because African populations show strong patterns of assortative mating. C. Numerous migrations to Africa throughout early human history has increased genetic diversity there. D. High levels of UV radiation in equatorial regions of the world have increased levels of genetic mutations in Africa.
Answer the following statement(s) true (T) or false (F)
1. The axon of a neuron can only communicate with other neuronal cells. 2. Neurons are the only electrically-active cells. 3. When a neuron is not firing, the sodium-potassium pump is inactive. 4. Humans are unique among animals due to our highly-evolved repertoire of sensory receptors. 5. A single type of receptor is responsible for detecting all tactile pressure in humans.
Which of the following is an example of a commensal relationship?
a. A bird nesting in a tree b. A tapeworm living in a human c. A bee getting nectar from a flower d. Protozoa living inside termites
Human skin color is thought to be determined by at least three pairs of alleles. If dark skin (D) is dominant to light skin (d), the genotypes that will produce the darkest skin are
A. D1d1 D2d2 D3d3. B. D1D1 D2d2 d3d3. C. d1d1 D2D2 D3d3. D. D1d1 D2d2 D3D3.