Which of the following is necessary for the fetus to develop female gonads?
a. lack of testosterone exposure
b. presence of Y chromosome
c. estrogen
d. progesterone
e. both estrogen and progesterone
ANSWER: a
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An enzyme has a total of four active sites. When you denature the molecule and study its composition, you find that each active site occurs on a different polypeptide. Which of the following hypotheses does this observation support?
A) The enzyme is subject to regulation. B) The enzyme requires a cofactor to function normally. C) The protein's structure is affected by temperature and pH. D) The protein has quaternary structure.
The cycad lineage probably arose from ____
a. club mosses b. seed ferns c. whisk ferns d. ginkgos e. palms
d. The neurotransmitter opens ion channels in the dendrite’s plasma membrane.
a. The plasma membrane is depolarized, resulting in a decrease in the voltage across the neuron membrane. b. Sodium ions enter the neuron. c. An electrical signal is received by the dendrite, and it then travels passively to the neuron body. d. The neurotransmitter opens ion channels in the dendrite’s plasma membrane.
Auxins lengthen coleoptiles, shoots, and roots by promoting cell __________. Fill in the blank(s) with the appropriate word(s)