Trace elements dissolved in seawater are present in concentrations less than one part per thousand
Indicate whether the statement is true or false
F
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The two-stage thymic selection process for selecting self-tolerant, antigen-reactive T cells results in
A) allelic exclusion. B) clonal deletion. C) complementarity-determining regions. D) somatic hypermutation.
According to the mathematical model developed by Wayne Getz to predict the existence of asexual or
sexual reproduction within a population:a. the offspring produced by sexual reproduction would be most successful in a stable environment. b. clones produced by asexual reproduction would succeed in an unstable environment. c. both strategies would coexist under conditions of moderate change. d. one assumption is that the offspring of sexual reproduction will use resources in the same way. e. one assumption is that the offspring of asexual reproduction will use resources differently.
Which of the following results in a spontaneous mutation?
A. exposure to ultraviolet light and benzo (a)-pyrene B. exposure to X-rays C. exposure to benzo (a)-pyrene, a chemical substance found in cigarette smoke D. exposure to ultraviolet light E. free radicals produced by cellular metabolism
What makes blood red?
A. globulins B. albumin C. hemoglobin D. fibrinogen E. platelets