At a research conference, you meet a graduate student who studies the hormonal underpinnings of mating behavior in two species of squirrel. "It turns out the difference between my two squirrel species is similar to the difference between the prairie and the montane voles," he says. You nod knowingly, and reply...
A. "Oh, so the monogamous species has a lot of serotonin and dopamine receptors in the nucleus accumbus, promoting pair bonding, and the promiscuous species doesn't?"
B. "Oh, so the polyandrous species has a lot of serotonin and dopamine receptors in the nucleus accumbus, promoting pair bonding, and the promiscuous species doesn't?"
C. "Oh, so the monogamous species has a lot of vasopressin and oxytocin receptors in the nucleus accumbus, promoting pair bonding, and the promiscuous species doesn't?"
D. "Oh, so the promiscuous species has a lot of vasopressin and oxytocin receptors in the nucleus accumbus, blocking pair bonding, and the monogamous species doesn't?"
Answer: C
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You have discovered an enzyme that can catalyze two different chemical reactions. Which of the following is most likely to be correct?
A) The enzyme contains ?-helices and ?-pleated sheets. B) The enzyme is subject to competitive inhibition and allosteric regulation. C) Two types of allosteric regulation occur: The binding of one molecule activates the enzyme, while the binding of a different molecule inhibits it. D) Either the enzyme has two distinct active sites or the reactants involved in the two reactions are very similar in size and shape.
How are cellulose and starch similar and how do they differ?
What will be an ideal response?
__________ is the process of maintaining a constant
internal environment. a. Hybridization b. Osmostasis c. pH adjustment d. Homeostasis e. None of these
How does a scientific theory differ from a scientific hypothesis?
A) Theories are proposed to test scientific hypotheses. B) Theories are usually an explanation for a more general phenomenon; hypotheses typically address more specific issues. C) Hypotheses are usually an explanation for a more general phenomenon; theories typically address more specific issues. D) Confirmed theories become scientific laws; hypotheses become theories.