TLS Online TPP Program

#Question id: 3886


Which one of the following statements about the reverse transcriptases of retroviruses and the RNA replicases of other single-stranded RNA viruses, such as R17 and influenza virus, is correct?

#Section 3: Genetics, Cellular and Molecular Biology
  1. Both enzymes can synthesize either RNA or DNA from an RNA template strand.

  2. Both enzymes can utilize DNA in addition to RNA as a template strand.

  3. Both enzymes carry the specificity for the RNA of their own virus.

  4. Both enzymes have error rates similar to those of cellular RNA polymerases.

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TLS Online TPP Program

#Question id: 3784

#Section 3: Genetics, Cellular and Molecular Biology

In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules?

TLS Online TPP Program

#Question id: 3785

#Section 3: Genetics, Cellular and Molecular Biology

The elongation of the leading strand during DNA synthesis

TLS Online TPP Program

#Question id: 3786

#Section 3: Genetics, Cellular and Molecular Biology

E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment?

TLS Online TPP Program

#Question id: 3787

#Section 3: Genetics, Cellular and Molecular Biology

A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture?

TLS Online TPP Program

#Question id: 3788

#Section 3: Genetics, Cellular and Molecular Biology

The spontaneous loss of amino groups from adenine in DNA results in hypoxanthine, an uncommon base, opposite thymine. What combination of proteins could repair such damage?

TLS Online TPP Program

#Question id: 3790

#Section 3: Genetics, Cellular and Molecular Biology

Semiconservative replication of DNA means that: