Which polysaccharide is consumed as a source of fiber?
A. glucose
B. glycogen
C. starch
D. cellulose
E. chitin
Answer: D
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Which of the following statements is not true concerning peptidyl transferase?
A) It is a ribozyme having catalytic activity. B) It catalyzes peptide bond formation. C) It moves the ribosome, so translation continues. D) It is associated with the large subunit of ribosomes. E) It requires no outside source of additional energy, such as ATP.
Which of the following linkage maps correctly shows the order and distance between the px, sp, and cn genes?
Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations. The offspring are as follows:
A) sp——0.21 m.u.——px——30.01 m.u.——cn
B) sp——30.01 m.u.——px——0.21 m.u.——cn
C) sp——0.2 m.u.——px——30 m.u.——cn
D) px——0.2 m.u.——sp——30.2 m.u.——cn
E) px——30.2 m.u.——sp——0.2 m.u.——cn
Antibodies and killer T cells recognize HIV or HIV-infected cells by binding to short pieces of viral proteins displayed on the virus or the infected host cell. These short pieces of viral proteins are called ________
A) coat proteins B) virosomes C) proteosomes D) epitopes E) episomes
mRNAs that lack an in-frame stop codon are degraded by the process of
a. nuclear surveillance. b. an miRNA decay pathway. c. nonsense-mediated decay (NMD). d. no-go decay (NGD). e. nonstop decay (NSD).