In humans, blood cells are produced in the ____
a. bone marrow
b. heart
c. kidneys
d. liver
e. lymph nodes
ANSWER: a
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The bottleneck effect
A. occurs when many members of a population die, resulting in a great loss of genetic diversity. B. occurs when many members of a population reproduce, causing too much genetic diversity within the population. C. occurs when small groups of individuals leave their home population and establish new settlements, mating only among themselves. D. occurs when large groups of individuals leave their home population and establish new settlements, mating only among themselves. E. does not occur in nature.
Adenylyl cyclase has the opposite effect of which of the following?
A) protein kinase B) protein phosphatase C) phosphodiesterase D) phosphorylase
In comparing the typical life cycles of plants and animals, a stage found in plants but not in animals is a
A) gamete. B) zygote. C) multicellular diploid. D) multicellular haploid
The substances in cell membranes that form a barrier to the movement of materials across the membrane are
A) carbohydrates. B) nucleic acids. C) lipids. D) external proteins. E) internal proteins.