Which of the following statements about poliovirus and SARS virus is TRUE?
a. Both have a VPg protein that facilitates replication.
b. Both form polyproteins that undergo post-translational cleavage.
c. Both have 30-kilobase genomes.
d. Both have single-stranded plus-sense RNA genomes.
Answer: D
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The energy source derived from the charge separation across the cytoplasmic membrane is referred to as
A) the proton motive force. B) carbohydrate charging. C) adenosine triphosphate. D) the voltage source.
Which is true about DNA replication?
A. It is semiconservative. B. It starts at an origin of replication. C. It is bi-directional. D. It requires RNA primers. E. All of the choices are correct.
The ecological model that random recruitment from the larval pool leads to high reef fish diversity is called:
a. competition model. b. predation disturbance model. c. lottery model. d. resource limitation model. e. optimal foraging model.
In fruit flies, the genes for body color and wing shape are linked. When a dihybrid black straight-winged fly is test-crossed with a double-recessive brown curly-winged fly, the frequency at which black curly-winged and brown straight-winged flies are seen in the progeny is called the _______ frequency.
A: mutation B: recombinant C: allele D: parental E: meiotic