You have isolated a newly discovered virus and are attempting to characterize it. You begin with its genome. You first isolate the virion-producing mRNA from cultured cells infected with the virus
When you compare these mRNA to the viral genome, you find that they are complementary. What does this tell you?
A) This virus has a positive-sense genome.
B) This virus has a negative-sense genome.
C) This virus has an ambisense genome.
D) The virus does not use DNA or RNA.
Answer: B
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In fruit flies, brown eyes can be caused by recessive mutant alleles of any one of three genes: pn (prune), bw (brown) or ry (rosy). The pn gene is X-linked, bw is on the second chromosome, and ry is on the third chromosome. One wild-type allele of each of the three genes must be present for eyes to be red (wild type). Suppose that two brown-eyed flies are crossed and their progeny consist of brown-eyed sons and red-eyed daughters. Which mutation is responsible for the brown eyes in the parental female?
A) pn B) bw C) ry D) either bw or ry E) any of the three—pn, bw, or ry
Variations in genes are called ________. Examples of these variations include eye color. There are blue eyes, green eyes, brown eyes, and several combinations of these.
A. polymorphisms B. alleles C. traits D. homeologues
Which of the following classes of Chordates is credited with producing the first amniotic egg?
a) Class Amphibia b) Class Aves c) Class Chondrichthyes d) Class Reptilia e) Class Mammalia
Which of the following is considered one of the guidelines for exercise training for asthmatics?
What will be an ideal response?