How does water enter and exit a cell?
a. By use of an integral transport protein
b. By simple diffusion or by use of an integral transport protein
c. By simple diffusion across the membrane
d. By use of a peripheral transport protein
Answer: b. By simple diffusion or by use of an integral transport protein
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As with people, cancer is much more common among dogs that are obese and have low
activity levels. Obesity and activity level are thus considered __________ for cancer in dogs.
a. carcinogens b. risk factors c. indicators d. oncogenes
The male gametophyte is indicated by
a. A. b. B. c. C. d. D. e. E.
The importance of computers and of computer software to modern cladistics is most closely linked to advances in _____
A) light microscopy B) radiometric dating C) fossil discovery techniques D) molecular genetics
An endemic disease
a. is constantly present in the populace. b. has a low incidence in the population. c. is persistent in the population because of the presence of reservoirs. d. is described by all of the above.