The thin filament contains _____ molecules.
A. actin
B. myosin
C. troponin
D. tropomyosin
E. All of the choices are correct except myosin
E. All of the choices are correct except myosin
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Which of the following scenarios leads to the highest level of lac operon expression?
A. high glucose levels, lactose absent B. low glucose levels, lactose absent C. high glucose levels, lactose present D. low glucose levels, lactose present
All living things have the following characteristics except
a. responsiveness to external and/or internal stimuli. b. utilization of energy. c. self-replication. d. growth. e. sexual reproduction.
Most prokaryotes
a. are rare in nature. b. are easily cultured in the laboratory. c. can’t be cultured. d. are large enough to see with the naked eye. e. are none of these.
Which of the following is true?
A) K-selection operates in populations where populations fluctuate well below the carrying capacity. B) r-selection occurs in populations whose densities are very near the carrying capacity. C) Different populations of the same species will be consistently r- or K-selected. D) r- and K-selection are two extremes of a range of life history strategies. E) r-selection tends to maximize population size, not the rate of increase in population size.