If a small region of a chromosome containing a non-essential gene is completely deleted, and an organism has two identical chromosomes with this deletion, then the organism
A) has no alleles of that gene.
B) is dead.
C) has more heterochromatin.
D) has recessive alleles of those genes.
E) will exhibit pseudodominance.
D
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Over time, the relationship between a pathogen and a naà¯ve susceptible population tends towards
A) the extinction of the host. B) the extinction of the pathogen. C) a balance between host and pathogen such that both are maintained. D) the extinction of either the host or the pathogen.
The tuberculin skin test, or the purified protein derivative (PPD) test, is based on:
a. delayed hypersensitivity cell-mediated immunity to certain antigenic components of the organism. b. injection of M. tuberculosis under the skin and subsequent mild cutaneous infection. c. antigen-antibody reactions occurring at the injection site. d. humoral-mediated immune response.
Competitive exclusion is the result of:
a. mutualism b. commensalism c. competition d. predation e. parasitism
In which of the following blood vessels would
pressure be the least?
a. arterioles serving skeletal muscles b. venules serving skeletal muscles c. the aorta d. the pulmonary artery e. the vena cavae