Which of the following carries amino acids to ribosomes, where amino acids are linked into the
primary structure of a polypeptide?
a. mRNA
b. tRNA
c. hnRNA
d. rRNA
e. rDNA
B
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In humans, skin color is controlled by several genes. Thus, skin color is a(n) ____ characteristic
a. dominant b. co-dominant c. epistatic d. pleiotropic e. recessive
The existence of a separate set of enzymes and DNA molecules in mitochondria and chloroplasts provide support for
serial endosymbiosis. __________________ Indicate whether the statement is true or false.
The clonal selection theory implies that
A. antigens activate specific lymphocytes. B. related people have similar immune responses. C. memory cells are present at birth. D. the body selects which antigens it will respond to. E. only certain cells can produce interferon.
What part of the DNA replication process would be most directly affected if a strain of bacteria lacking primase were used to make the cell extracts?
(a) initiation of DNA synthesis (b) Okazaki fragment synthesis (c) leading-strand elongation (d) lagging-strand completion