Which one of the following statements about gender determination is TRUE?
A) The male gender is determined by the presence of only one X chromosome.
B) The male gender is determined by the presence of a Y chromosome.
C) The hormones estrogen and progesterone are key players in the development of internal and external female genitalia.
D) The development of male genitalia is the "default" condition in the absence of estrogen.
E) The development of female genitalia is activated by the presence of anti-Mullerian hormone.
B
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How does losing or acquiring territory affect the brain anatomy and chemistry of an African cichlid fish?
a. only the size of the brain is changed b. only the shape of brain is changed c. both the size and shape of the brain are changed d. the size of brain cells producing sex hormones are changed e. the size of brain cells producing territorial hormone are changed
In eared seals, the main propulsive force for swimming is produced by the:
a. forelimbs. b. hindlimbs. c. undulations of the body. d. tail. e. caudal fin.
What might happen if a protein has a change in one amino acid?
A) The amino acid chain folds incorrectly. B) The protein can no longer function properly. C) The protein has a new shape. D) All of these happen.
Which of the following evidence obtained from fossil studies is generally accepted as marking the beginning of the hominids?
A. Manufacture and use of tools B. Large brain development C. Walking upright D. Bipedalism E. Development of lower limbs longer than forelimbs