The acrosomal reaction is the ____
a. activation of a sperm cell through attachment of an acrosome
b. release of digestive enzymes from the acrosome after the initial attachment of a sperm to an egg
c. fusion of sperm and egg nuclei using enzymes from the acrosome
d. use of enzymes from the acrosome to block the attachment of other sperm cells to the egg
e. initial binding of the sperm to the zona pellucida
ANSWER: b
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The structure pictured in the figure is found in _____
A) skeletal muscles and smooth muscles B) cardiac muscles and skeletal muscles C) smooth muscles and cardiac muscles D) smooth muscles, skeletal muscles, and cardiac muscles E) smooth muscles
Annual influenza vaccinations are important for all individuals because
A. the virus is stable so once the vaccine is administered, protection from antibodies is lifelong. B. the highly contagious nature of the virus means that transmission from a robust individual to those with a weaker immune system, such as the young or the elderly, is facilitated in crowded winter conditions. C. the oral-fecal transmission route makes it easy to pass to others. D. the vaccine prevents secondary infections in individuals with influenza.
The bases of RNA are the same as those of DNA with the exception that RNA contains
A. cysteine instead of cytosine. B. cytosine instead of guanine. C. uracil instead of adenine. D. uracil instead of thymine.
The normal human karyotype contains __________ autosomes
a. 22 b. 23 c. 44 d. 46 e. 54