The body system which functions to regulate the activities of other body systems by secreting chemical messengers called hormones is the
A. endocrine system.
B. cardiovascular system.
C. nervous system.
D. respiratory system.
Ans: A. endocrine system.
Biology & Microbiology
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A. mRNA B. tRNA C. translation factors D. ribosomes E. protein polymerase
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Any change in allele frequencies in a gene pool
is
a. natural selection. b. macroevolution. c. microevolution. d. mutation. e. artificial selection
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Rods are
a. sensitive to red light. b. sensitive to green light. c. sensitive to blue light. d. relatively insensitive to dim light. e. sensistive to dim light.
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Antibiotics are most likely to be effective in the treatment of infections caused by
A) bacteria. B) viruses. C) parasitic worms. D) lice and ticks. E) prions.
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