Males of many marsupial species have forked penises that are incompatible with the anatomy of female placental mammals. What type of isolating mechanism does this represent?
A. temporal isolation
B. mechanical incompatibility
C. ecological isolation
D. hybrid sterility
E. prevention of gamete fusion
Answer: B
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Which is NOT a checkpoint in the cell cycle?
A. the transition from G1 to S phase B. the transition from G2 to M phase C. the transition from M phase to G1 D. the beginning of M phase E. All of these choices are checkpoints in the cell cycle.
Abscisic acid (ABA) is synthesized in the roots in response to decreased soil water potential. ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells. What effect would this have on the stomata and the process of transpiration?
A. The stomata would open thereby increasing the rate of transpiration. B. The stomata would open thereby decreasing the rate of transpiration. C. The stomata would close thereby decreasing the rate of transpiration. D. The stomata would close thereby increasing the rate of transpiration. E. The change in the stomata would have no effect on the rate of transpiration. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the relationship between transpiration and stomata? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
What part of the ATP synthase is responsible for catalyzing ATP formation?
a. the basal unit b. the headpiece c. the stalk d. the lollipop e. the electrons
The codon that signals the end of a growing polypeptide is called a _________ codon
Fill in the blank(s) with the appropriate word(s).