Which of the following is true about the mammary glands?
A) They are not sexual organs, though they are impacted by sex hormones.
B) They are part of the female reproductive system.
C) They are sexual organs that do not have direct reproductive function.
D) They have no relationship to the female reproductive system.
C
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Each thick filament contains about ______ protein molecules (each molecule has two heads and two braided tails)
A. 2 B. 20 C. 200 D. 2000
An ionic bond forms between ________.
A. a cation and an anion B. an anion and another anion C. a cation and another cation D. All of the choices are correct.
Allowing small children to be exposed to some dirt is one way of imparting
A) naturally acquired active immunity. B) artificially induced active immunity. C) innate (nonspecific) immunity. D) naturally acquired passive immunity. E) artificially induced passive immunity.
Many genes occur in alternative forms called alleles
Indicate whether the statement is true or false