The molecule that shuttles amino acids during protein synthesis is ____
a. DNA
b. mRNA
c. rRNA
d. tRNA
e. dRNA
ANSWER: d
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______ collagen is the most rigid and is very abundant in bones and tendons?
A. Type IV B. Type V C. Type I D. Type III E. Type II
Substrate-level phosphorylation
a. occurs during glycolysis. b. requires the presence of oxygen. c. is a precursor for the phosphorylation of glucose. d. is the source for the majority of the ATP produced in aerobic respiration. e. does not occur during the Krebs cycle.
Proteins carry out much of the biochemistry of life, including DNA replication, but DNA stores the information needed to build correct proteins. Early life forms would have needed both proteins and DNA, but neither can exist without the other
The RNA world hypothesis is an appealing solution to this problem, because it states that ________. A) RNA can evolve into DNA by natural selection B) proteins can store the information needed for their own synthesis C) RNA is more chemically stable than DNA D) nucleotides of RNA are chemically similar to amino acids E) some RNA molecules both store information and catalyze chemical reactions
Lampreys differ from fishes in that lampreys
A) lack a backbone. B) lack an endoskeleton. C) lack jaws. D) possess a backbone and skull.