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.


A. Only amino acids contain sulfur.

Biology & Microbiology

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The term_____ case is used to refer to the first patient found in an epidemiological investigation, although this individual may not be the first case of the infection in the outbreak

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Refer to Table 19-1. If the expression of alleles is simple dominance (D) and recessive (d), then the

frequency of the recessive phenotype is: a. 0. b. 0.1. c. 0.2. d. 0.3. e. 0.5.

Biology & Microbiology

The ________ pathway is important in early nonspecific responses to infection because it occurs in the absence of antibodies.

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Biology & Microbiology