Which of the following protein classes are not found as membrane proteins?
A. transport channels
B. hormones
C. receptors
D. enzymes
E. identity markers
B. hormones
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Thymine dimers are dealt with by
A. no repair mechanisms. B. photoreactivation repair. C. SOS repair. D. excision repair. E. photoreactivation repair AND excision repair.
You are excited because you just purchased a male guppy that has red, blue and green colors on its fins and tail. Your guppies at home do not have this combination of colors. You place the new male in with three females for mating purposes. After three weeks you have many new baby guppies and with the new color combination. This is an example of which type of selection?
A. Natural B. Environmental C. Analogous D. Convergent E. Artificial
Which of the following is a characteristic of whisk ferns?
a. yellow knobs on branch tips b. deep, branching roots c. large, fringed fronds d. reddish-brown sporophytes
Which of these gives the correct order from large to small?
a) muscle ? muscle cell ? myofibril ? sarcomeres ? filaments b) muscle ? sarcomeres ? myofibrils ? actin filaments ? myosin filaments c) muscle ? myofibrils ? sarcomeres ? muscle cells ? filaments d) muscle ? muscle fibers ? sarcomeres ? filaments ? myofibrils e) muscle cells ? myofibrils ? filaments ? sarcomeres