Which epithelial cell is modified for diffusion?
a. cuboidal
b. simple squamous
c. simple columnar
d. stratified squamous
e. stratified columnar
B
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Which of the following is a gastropod?
(a) clam. (b) snail. (c) squid. (d) octopus.
Which of the following is true of the trombone model of replication?
A. As Okazaki fragments are extended by Pol I, the loop in the DNA template grows. B. Once an Okazaki fragment is completed, the ? clamp is ejected. C. A loop is formed in one strand of the template DNA to allow 5'-3' synthesis of the leading strand. D. When a new ? clamp is loaded, primase is triggered to synthesize a primer. E. Binding of the polymerase core to a new primer/template complex triggers loading of the ? clamp.
In the embryonic development of flowering plants, the basal cell develops into the:a
apical cell. b. apical meristem. c. suspensor. d. integuments. e. endosperm.
Cholesterol affects the fluidity of membranes into which it inserts by
a. increasing membrane fluidity at all temperatures. b. decreasing membrane fluidity at all temperatures. c. decreasing membrane fluidity at high temperatures and increasing membrane fluidity at low temperatures. d. increasing membrane fluidity at high temperatures and decreasing membrane fluidity at low temperatures.