A predictably recurring time when the female

becomes sexually receptive to the male in most
mammals is
a. estrus.
b. endometrium.
c. menstruation.
d. coitus.
e. parturition.


Answer: a

Biology & Microbiology

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Answer the following statement true (T) or false (F)

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Which hormone acts on the Sertoli cells to help sperm mature?

a. testosterone b. FSH c. LH d. GnRH e. hCG

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Why would a scientist use DNA fingerprinting to answer a question about human migration?

A) to determine what race a person belongs to B) to determine the paternity of an individual C) to determine the frequency of a particular allele in different populations D) to determine whether a recessive allele gave an advantage in a particular environment

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Which of the following terms describes a substance formed by the combination of two or more elements in definite proportions?

a) compound b) isotope c) nucleus d) enzyme

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