A testcross is a way to determine _____
a. phenotype
b. genotype
c. phenotype and genotype
B
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A change in a single nucleotide that results in no change in the amino acid sequence of the polypeptide produced is known as a
A) nonsense mutation. B) silent mutation. C) missense mutation. D) frameshift mutation. E) none of the above
Which of the following statements about Caenorhabditis elegans is FALSE?
a. It is asexual. b. It is anatomically simple. c. It has a fixed cell number. d. Specimens do not have to be killed to be studied. e. It completes its life cycle in three days.
Color vision begins with stimulation of _____
a. hair cells c. cone cells b. rod cells d. neuroglia
Viruses, Rickettsia, and Chlamydia are described as obligate intracellular parasites because they can only be propagated inside living host cells. Which of the following would be appropriate for their cultivation?
A. enriched media B. differential media C. cell or tissue cultures D. media that contains sheep red blood cells