An allele whose expression is completely masked by the expression or effect of its allelic partner is
(a) homologous.
(b) homozygous.
(c) dominant.
(d) recessive.
(d) recessive.
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In the Hershey-Chase experiment, bacterial viruses, called phage, were used to demonstrate that DNA is the genetic material. The phage that were used for this experiment consisted of DNA surrounded by a protein coat. Phage will attach to specific types of bacteria and inject their DNA into the bacterial cell. To scientifically determine whether DNA is the genetic material, Hershey and Chase made
phage in a medium containing radioactive sulfur-35 (S35). Why was S35 used in this experiment? A. Only amino acids contain sulfur. B. Only nucleic acids contain sulfur. C. Both nucleic acids and amino acids contain sulfur. D. The radioactive sulfur labels peptide bonds.
When DNA replication begins, _____
a. the two DNA strands unwind from each other b. the two DNA strands condense for base transfers c. two DNA molecules bond d. old strands move to find new strands e. the sugar phosphate backbone is degraded
Which chemical produced by cancer cells promotes blood vessel growth?
a. angiogenin b. interleukins c. cytokines d. HCG e. thyroxine
In a chromosomal inversion, a segment of a chromosome is:
a. reversed. b. duplicated. c. lost. d. attached to a nonhomologous chromosome. e. deleted.