Refer to the accompanying figure. The portion of the molecule labeled as 5 is:
a. the attached amino acid.
b. a double-stranded DNA region.
c. a single-stranded DNA region.
d. the anticodon.
e. the codon.
a
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During the end-Permian mass extinction:
A. oxygen levels in the deep oceans dropped. B. global warming occurred as a result of volcanic eruptions. C. oceans were acidified as a result of volcanic eruptions. D. oxygen levels in the deep oceans dropped and oceans were acidified as a result of volcanic eruptions. E. all of the answer options are correct.
A time lag in the response of survivorship and fecundity to a population's density can occur because ____ is usually
determined by the availability of resources at some time in the past.
a. death b. immigration c. fecundity d. competition e. population growth
Humans can digest starch but not cellulose because ________
a. starch is held together by a different type of linkage than cellulose is b. starch and cellulose are composed of different monomers c. the structure of starch is stabilized by hydrogen bonding d. the monosaccharide in starch carries a nitrogen-containing functional group
The sodium-potassium pump is called an electrogenic pump because it _____
A) pumps equal quantities of Na+ and K+ across the membrane B) contributes to the membrane potential C) ionizes sodium and potassium atoms D) is used to drive the transport of other molecules against a concentration gradient