Temperate phages are those that can enter either the ________ or the ________ cycle
A) complementing; competing
B) lytic; lysogenic
C) former; nonformer
D) virulent; avirulent
E) functional; nonfunctional
Answer: B
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A theory of eukaryotic cells and nuclear origin is based on endosymbioses, where an archaeal cell is thought to have engulfed a bacterium, which then donated genes that would eventually become the nuclear genome of an ancestral eukaryote.
Answer the following statement true (T) or false (F)
What is the primary function of the transverse tubules?
A. They conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils. B. They act as a channel for Ca2+ ions during excitation-contraction coupling. C. They form cross-bridges between actin and myosin during muscle contraction. D. They attach troponin to tropomyosin. E. They attach muscle fibers to skeletal elements to exert force.
Life history patterns of guppies in Trinidad are a result of which natural selection force?
a. Competition differences in different streams. b. Predation differences in different streams. c. Temperature differences in different streams. d. Pollution differences in different streams. e. Salt concentration differences in different streams.
The ratio between the uptake of carbon dioxide by photosynthesis and the release of carbon dioxide by respiration is approximately
A. 0.5 (i.e., half as much carbon dioxide is taken up by photosynthesis as is released by respiration). B. 5 (i.e., five times as much carbon dioxide is taken up by photosynthesis as is released by respiration). C. 0.1 (i.e., one-tenth as much carbon dioxide is taken up by photosynthesis as is released by respiration). D. 2 (i.e., twice as much carbon dioxide is taken up by photosynthesis as is released by respiration). E. 1 (i.e., about the same).