A good date for Australopithecus afarensis:
A. 1 mya
B. 2.5 mya
C. 3.6 mya
D. 4 mya
E. 7 mya
Answer: C. 3.6 mya
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The Na+/K+ pump creates a ____ charge inside the cell and a ____ charge outside the cell
a. negative; negative b. positive; negative c. positive; positive d. negative; positive e. neutral; positive
The bitter receptor hTAS2R38 is activated by glucosinolates found in plants such as turnips and broccoli. Glucosinolates can block synthesis and transport of iodine. Before the advent of iodized salt, this was a particular problem in areas of the world that are naturally low in iodine. Why might the human population include different variants of the hTAS2R38 gene?
A. Areas of high iodine are generally coastal, and turnips and broccoli are not easily grown there. B. Iodine created mutations in the hTAS2R38 gene. C. Where iodine was low, eating plants rich in glucosinolates helped people metabolize iodine, but where iodine was high they avoided such foods. D. Where iodine was low, it was important to avoid foods with glucosinolates, but where iodine was plentiful, palatability of a wider range of plants was beneficial. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about taste receptors? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process 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?
Human cultural evolution is generally divided into three stages. Explain how each has affected Earth. What will be an ideal response?
During recombination ________________________
(a) sister chromatids undergo crossing-over with each other. (b) chiasmata hold chromosomes together. (c) one crossover event occurs for each pair of human chromosomes. (d) the synaptonemal complex keeps the sister chromatids together until anaphase II.