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Codons


A) are triplets coding for a single amino acid.
B) are the alphabet of the genetic language.
C) each have only one meaning.
D) All of the choices are correct.
E) Only two of the choices are true.

F) A) and E)
G) B) and E)

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DNA was shown to be the transforming substance when only the ______ enzymes could inhibit transformation.


A) proteinase
B) RNAase
C) DNAase
D) lipase

E) B) and D)
F) B) and C)

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DNA replication is considered semiconservative because


A) it will create three new, identical strands when finished.
B) it uses the original strand as a template for replication.
C) it always replicates in the 3 to 5 prime direction.
D) it never replicates in the 5 to 3 prime direction.

E) B) and D)
F) All of the above

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A sample of Chargaff's data on the DNA base composition in various species is provided. Discuss several conclusions that may be drawn from this data? A sample of Chargaff's data on the DNA base composition in various species is provided. Discuss several conclusions that may be drawn from this data?

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Answers may vary. Several conclusions ma...

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Transcription is initiated when


A) initiation factors assemble ribosomal subunits, mRNA, and initiator tRNA.
B) RNA polymerase comes to a stop sequence.
C) RNA polymerase binds to a region of DNA called the promoter.
D) new nucleotides are added to an existing strand of nucleotides.

E) All of the above
F) B) and D)

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Write an essay describing the 3 main steps of DNA replication in the correct order. Be sure to include the key structures involved in the process.

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Answers will vary but should include the...

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During DNA replication, the enzyme ___________, catalyzes the elongation of new DNA by adding, to the 3' end of the previous nucleotide, new nucleotides that are complementary to a DNA template.


A) helicase
B) DNA polymerase
C) DNA ligase
D) ATP synthase

E) A) and B)
F) All of the above

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In an experiment, neither heat-killed R strain nor heat-killed S strain can kill the mice. This finding

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An experiment was performed that demonstrated that RNAase fails to prevent transformation of the R strain to S strain. This finding


A) supports Hypothesis I.
B) supports Hypothesis II.
C) supports Hypothesis III.
D) rejects Hypothesis I only.
E) rejects Hypothesis II only.
F) rejects Hypothesis III only.
G) does not support or provide information to reject any of these hypotheses.

H) A) and E)
I) D) and F)

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