Studies of sex chromosome aneuploidy reveal that ____ necessary for survival
a. the X chromosome is not
b. the Y chromosome is not
c. two copies of the X chromosome are
d. two copies of the Y chromosome are
e. at least one copy of both the X and the Y chromosome is
b
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Which of the three cytoskeletal fibers contribute to the structural integrity and strength of epithelial tissues in animals?
A. intermediate filaments and microfilaments B. intermediate filaments and microtubules C. microtubules and microfilaments
When studying fluid and electrolyte loss during exercise, Robert Cade found that human sweat has sodium and chloride concentrations that are
A. higher than those found in the blood. B. lower than those found in the blood. C. equal to those found in the blood. D. extremely variable from person to person relative to those found in the blood.
Traits which by logic should show less genetic variation because of their close association with reproduction fall into which category?
A) life-history traits B) behavioral traits C) physiological traits D) morphological traits
Protection from infection known as species resistance is a result of
A) the lack of suitable environment in the body. B) the absence of receptors required for microbial attachment. C) the presence of phagocytes in the tissues. D) the salty, acidic condition of normal skin. E) both the absence of necessary receptors and lack of suitable environment in the body.