When antibodies bind antigens, the clumping of antigens results from _____
A) the antibody having at least two binding regions
B) disulfide bridges between the antigens
C) a complement that makes the affected cells sticky
D) bonds between class I and class II MHC molecules
E) denaturation of the antibodies
Answer: A
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Darwin calculated that if reproduction was not limited, a single pair of elephants could leave ____
descendants after 750 years.
a. 750 b. 15,000 c. 150,000 d. 19 million e. 190 million
In clinical trials, control groups of individuals who receive a safe but noneffective treatment instead of the drug being studied are being given ________
A) stem cells B) a placebo C) a double-blind trial D) efficacy E) None of these choices
Natural selection would have selected for those protocells and cells that were more able to use the energy available in their environment to allow growth and replication.
a. true b. false
Organic brain syndrome is a term used to describe a condition in which a person's abnormal behavior is:
A) irreversible and cannot be linked to a physical abnormality or the influence of illicit substances. B) caused by premature brain cell deterioration that is progressive and cannot be reversed. C) directly related to an endocrine disturbance that results in the underproduction of key hormones. D) caused by a physical illness or the influence of a substance that interferes with normal cerebral function.