In humans, blood cells are produced in the ____

a. bone marrow
b. heart
c. kidneys
d. liver
e. lymph nodes


ANSWER: a

Biology & Microbiology

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Adenylyl cyclase has the opposite effect of which of the following?

A) protein kinase B) protein phosphatase C) phosphodiesterase D) phosphorylase

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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

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The substances in cell membranes that form a barrier to the movement of materials across the membrane are

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