When a phosphate group is transferred from ATP, active transport pumps ____
a. trigger exocytosis
b. change their shapes
c. become ionized
d. fuse with the surrounding phospholipid membrane
e. are destroyed
ANSWER: b
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Mutations in opsin proteins in the cones will lead to ____
a. difficulty seeing at night b. colorblindness c. complete blindness d. tunnel vision e. cortical blindness
What best summarizes the oocyte's contribution to the zygote? a. The oocyte contributes paternal DNA
b. Numerous substances are contributed by the oocyte, including maternal DNA, enzymes, yolk, and proteins. c. Nothing; an oocyte forms after several cleavages of the zygote. d. Oocytes are the source of the enzymes used by the sperm to penetrate the egg's membrane.
In Figure 47-1, dentin is labeled as number:
a. 1
b. 2
c. 3
d. 4
e. 5
The history of biotechnology spans
A) around 100 to 150 years. B) about 1,000 years. C) at least 10,000 years. D) fewer than 50 years.