Typically, one sperm fertilizes an oocyte because ____

a. an acid solution is released that kills all other sperm
b. special organelles within the oocyte eject more than one sperm
c. changes occur to the oocyte's protein coat that prevent further penetration
d. follicle cellular space is only wide enough for one sperm
e. usually only one sperm arrives at the oocyte


ANSWER: c

Biology & Microbiology

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Examine Figure 24.1 in your text. Which of the following groups is monophyletic?

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The gizzard carries out the same function in birds, alligators, and earthworms as ____ do in insects

Fill in the blank with the appropriate word.

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Adaptive immunity is also referred to as ____ immunity

a. acquired b. innate c. secondary

d. latent e. hidden

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Fragments of DNA can be separated by electrophoresis according to _____

a. sequence b. length c. species d. composition

Biology & Microbiology