Hormones are effective because they are
A. recognized by specific receptors.
B. faster than nervous impulses.
C. each effective on every cell in the body.
D. produced by the body.
Answer: A
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In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are _____
A) the acrosomal reaction and the formation of egg white B) the cortical reaction and the formation of yolk protein C) the jelly coat of the egg and the vitelline membrane D) membrane depolarization and the cortical reaction E) inactivation of the sperm acrosome
What kind of gland is a sweat gland?
a. exocrine b. endocrine c. sensory d. dermal e. follicle
In prophase, ribosomal RNA synthesis stops when the chromosomes condense, and as a result
A. the nucleolus disappears. B. the chromosomes line up at the equator of the cell. C. the nuclear envelope reforms. D. the chromosomes lengthen.
Figure 28.12
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The following question refers to the accompanying figure illustrating transport in phloem.
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Letter ____ can indicate a fruit or developing root cells.
A. A B. B C. C D. D E. E