Which of these molecules may be found on both surfaces of the plasma membrane, but never spanning between them?
a. cholesterol
b. integrin
c. peripheral protein
d. phospholipid
c. peripheral protein
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What limitation(s) make it impossible to travel between stars? I. fuel requirements II. the tremendous distances between stars III. the finite speed at which objects can travel
a. I b. II c. III d. II & III e. I, II, & III
To overcome the water/salt balance problem, fish have specialized cells that can either take in salts or excrete salts that are located in their
a. kidneys. b. lungs. c. gills. d. pharynx. e. skin.
Cells with gap junctions are typical of tissues
a. that suffer wear, abrasion, and mechanical insults. b. such as bone and cartilage that must withstand external forces. c. that require rapid exchange of chemical messages, as is the case for cardiac muscle. d. that secrete enzymes or hormones. e. described by all of these.
When a cancer remains in one location, it is referred to as
A) benign. B) dysplasia. C) in situ cancer. D) hyperplasia. E) metastasis.