In mammals, the master clock is located in the:a
pineal gland.
b. suprachiasmatic nucleus.
c. crepuscular gland.
d. biological clock.
e. pituitary gland
B
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During which stage(s) of human development are all major organs formed?
a. embryonic, fetal, and postnatal periods b. fetal period only c. embryonic period only d. both the embryonic and the fetal periods
Down syndrome in humans is due to
A. two Y chromosomes. B. trisomy (three copies of chromosome 21). C. three X chromosomes. D. monosomy (one copy of chromosome 21).
Which of the following sets of organs are involved in producing enzymes that are involved in breaking down proteins to amino acids?
A. Salivary glands, stomach, pancreas, liver B. Liver, stomach, pancreas, intestinal lining C. Pancreas, intestinal lining, salivary glands, stomach D. Stomach, pancreas, intestinal lining
As the human immunodeficiency virus (HIV) begins to kill the host's _____________________, the host's immune system begins to fail.
a. liver cells b. RNA c. red blood cells d. DNA e. white blood cells