A prokaryotic cell
A. has a cell wall made of chitin.
B. is at least 10 micrometers in diameter.
C. does not have a nucleus.
D. has membrane-bounded organelles.
E. has a nucleus.
C. does not have a nucleus.
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Konrad Lorenz taught ducks to behave as though he were their mother by providing the appropriate stimulus during a sensitive period. This form of learning is called
A) classical conditioning. B) fixed action behavior. C) altruism. D) habituation. E) imprinting.
Competitive exclusion is the result of
a. mutualism. b. commensalism. c. competition. d. predation. e. parasitism.
The hormone whose levels remain high when the body is suffering from inflammation and low glucose
levels is a. cortisol. b. somatotropin. c. thymosin. d. prolactin. e. parathyroid hormone.
Aminoglycosides
A. attach to the 30S ribosomal subunit and disrupt protein synthesis. B. damage cell membranes. C. block peptidases that cross-link glycan molecules. D. destroy peptidoglycan. E. are metabolic analogs of PABA and block folic acid synthesis.