The term replication refers to DNA’s ability to

a. attack bacteriaphages
b. make copies of itself
c. respond to X-ray photography
d. twist into a helix

Meselson and Stahl performed the density-gradient centrifugation of DNA in a solution of calcium chloride.

a. True
b. False

Sulfur is

a. found in bacteria but not viruses.
b. found in proteins but not nucleic acids.
c. found in nucleic acid but not proteins.
d. found in viruses but not bacteria.
e. needed for bacteriophages to attach to bacteria.

Chargaff’s rule state that in DNA, the amount of adenine equals

a. the amount of cytosine
b. the amount guanine
c. the amount of thymine
d. the amount of guanine and thymine

Each complete turn of the DNA helix is how long?

a. 2.0 nm
b. 5.0 nm
c. 2.1 nm
d. 3.0 nm
e. 3.4 nm

Griffin did an experiment in which live R bacteria was changed by dead S bacteria. Such a change is an example of
Select one:
a. translocation
b. transformation
c. transduction
d. fertilization

One of Chargaff’s rules state

a. A + T = G + C
b. A + G = T + C
c. A = G, T = C
d. A = C, T = G

The diameter of the DNA ladder is always

a. 2.5 nm
b. 1.5 nm
c. 2.0 nm
d. 3.0 nm
e. 3.4 nm

Which of the following is a purine base?

a. thymine
b. malomine
c. adenine
d. All of the above
e. cytosine

According to the base pairing rules, guanine binds with

a. guanine
b. adenine
c. thymine
d. cytosine

Which of the following is a pyrimidine base?
Select one:
a. colchicines
b. guanine
c. adenine
d. None of the answers
e. thymine

Each nucleotide in a DNA molecule is constructed of
Select one:
a. a phosphate group, a five carbon sugar, and a nitrogen base
b. a phosphate group, a six carbon sugar, and a nitrogen base
c. a phosphate group, a five carbon sugar, and a oxygen base
d. a sulfur group, a five carbon sugar molecule, and a nitrogen base