Excess sugars stored by high-latitude algae can
a. serve as accessory to cellulose.
b. serve as antifreeze in winter.
c. keep predators away.
d. confuse predators with different colors.
e. protect the algae from wave damage.
B
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A mutation in E. coli results in the loss of both restriction endonucleases and modification enzymes. Would you expect any difference in the frequency of gene transfer via transduction FROM Salmonella INTO this E. coli strain?
A. No-since the Salmonella strain is normal, the rate of production of transducing virus particles would still be the same, resulting in the same frequency of gene transfer. B. Yes-the loss of the restriction endonucleases would leave the recipient E. coli unable to break down "invading"' viral DNA from the transducing phage. This would lead to higher rates of successful transduction. C. Yes-the loss of the modification enzymes would leave the recipient E. coli unable to tag its own DNA as "self," leaving the viral DNA untagged and recognizable as "foreign," and targeted for destruction. This would lead to higher rates of successful transduction. D. No-transduction efficiency isn't affected by either restriction endonucleases or modification enzymes, so there'd be no effect on the overall rate. E. Yes-the loss of the restriction endonucleases would leave the recipient E. coli unable to break down "invading" viral DNA from the transducing phage, AND the loss of the modification enzymes would leave the recipient E. coli unable to tag its own DNA as "self," leaving the viral DNA untagged and recognizable as "foreign," and targeted for destruction. Together, thesewould lead to higher rates of successful transduction.
Which group includes the highest proportion of critically endangered, endangered, and vulnerable species?
a. cone snails b. conifers c. freshwater shrimps d. reef-forming corals e. cycads
the prose Darwin used to describe his broad theory of evolution is "Descent with ---"
Fill in the blank(s) with the appropriate word(s).
Character states shared by the ancestor or outgroup of a clade are called
A. derived traits. B. synapomorphies. C. plesiomorphies. D. homoplasies. E. symplesiomorphies.