The polysaccharides agarose and carrageenan are isolated from red algae for commercial use. These polysaccharides are found in cell walls. What plant polysaccharide are they analogous to?
A. Mannose
B. elastin
C. Cellulose
D. Collagen
E. Amylose
Answer: C
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A frameshift mutation could result from _____
A) a base insertion only B) a base deletion only C) a base substitution only D) deletion of three consecutive bases E) either an insertion or a deletion of a base
Which statements about the Lake Victoria cichlid fishes are true? Check all that apply.
__X__ The adaptive radiation of the estimated 300 species of cichlid fish was very rapid and took place during the last 200,000 years. _____ The adaptive radiation of the Lake Victoria cichlids may have resulted from a key evolutionary innovation. _____ Speciation of the Lake Victoria cichlids was mainly sympatric. _____ The diversity of the Lake Victoria cichlids continues today because the lake is devoid of predators. _____ Many of the Lake Victoria cichlids have very specialized adaptations that allow them to occupy diverse habitats within the lake.
How do cells distinguish between estrogen and testosterone?
a. only male cells respond to testosterone and female cells respond to estrogen b. estrogen is hydrophilic and binds to surface receptors, while testosterone is hydrophobic and binds to internal receptors c. estrogen and testosterone have similar functional groups but different basic structures that are easily distinguished by their individual receptors d. estrogen and testosterone have the same basic structures, but different side chains that are easily distinguished by their individual receptors e. estrogen and testosterone bind to different carrier proteins, which help receptors distinguish between the two molecules
The luteinizing hormone (LH) ____
a. affects sex steroid hormone secretion b. has no function in males c. is produced by the corpus luteum d. stimulates milk production e. encourages growth of bone and soft tissues