Indifferent gonads are
A) the gonads of people who have no interest in having sex.
B) paired structures in the embryo that can develop as either testes or ovaries.
C) paired structures in the embryo that follow a male developmental program and a female pathway in the same person at the same time.
D) the gonads that develop when a person uses birth control.
B) paired structures in the embryo that can develop as either testes or ovaries.
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Which of the following choices best describes gated transporters? a. Gated transporters are channels or pores in the membrane that are always open
b. Gated transporters expend energy to move molecules against concentration gradients. c. Gated transporters change shape in response to binding or charge, releasing the molecule on the other side. d. Gated transporters move two substances across the membrane in opposite directions.
Which of the following first appears in a third trimester human fetus?
a. lanugo hair b. open eyes c. facial expressions d. sucking movements e. heart beats
Dieldrin was a chlorinated hydrocarbon insecticide that was remarkably useful against termites because it did not seem to degrade when applied to wood. What issue would you expect with its use?
A) chlorination B) decomposition C) expressive toxicity D) biological magnification
What error of meiosis leads to both a duplication and a deletion?
A) unequal crossing over B) X-ray chromosomal breakage C) replication cross formation D) replication errors E) D loop formation