Quick 10Q: DNA Experiments

Griffith investigated R and S strains with mice. What did he conclude about the S strain and the R strain in the trial with heat-killed S strain and living R strain?

• The mouse lived as the R strain provided protection from the nonliving S strain.

• The mouse died as the R strain did not provide protection from the nonliving S strain.

• The mouse lived as the R strain was not affected by a transforming agent released from the nonliving S strain.

• The mouse died as the R strain was affected by a transforming agent released from the nonliving S strain

Tags

NGSS.HS-LS3-2

What was the difference between the R and S strains in the Griffith experiment?

• R strain was pathogenic while S strain was not pathogenic

• R strain was not pathogenic while S strain was pathogenic

• R strain had antibodies against the S strain

• S strain had antibodies against the R strain

What technology did Rosalind Franklin use to produce the image of the DNA molecule used by Watson & Crick?

• X-ray crystallography

• Electron microscope

• Light microscope

• NMR

What feature did Hershey and Chase use to differentiate between the protein and nucleic acid in their experiment?

• Proteins have phosphorus and Nucleic acids have sulfur

• Proteins have sulfur and Nucleic acids have phosphorus

• Proteins are single stranded and Nucleic acids are double stranded

• Proteins are double stranded and Nucleic acids are single stranded

Based on the conservative model, what are the predicted results from two rounds of replications in the Meselson-Stahl experiment where the initial strands are ¹⁵N and the new strands are ¹⁴N?

• The first round involves a hybrid (¹⁴N-¹⁵N) band, the second round involves a light (¹⁴N) band and a hybrid (¹⁴N-¹⁵N) band

• The first round involves a hybrid (¹⁴N-¹⁵N) band, the second round involves a hybrid (¹⁴N-¹⁵N) band

• The first round involves a heavy (¹⁵N) band and a light (¹⁴N) band, the second round involves a hybrid (¹⁴N-¹⁵N) band.

• The first round involves a heavy (¹⁵N) band and a light (¹⁴N) band, the second round involves a heavy (¹⁵N) band and a light (¹⁴N).

Based on the semiconservative model, what are the predicted results from two rounds of replications in the Meselson-Stahl experiment where the initial strands are ¹⁵N and the new strands are ¹⁴N?

• The first round involves a hybrid (¹⁴N-¹⁵N) band, the second round involves a light (¹⁴N) band and a hybrid (¹⁴N-¹⁵N) band

• The first round involves a hybrid (¹⁴N-¹⁵N) band, the second round involves a hybrid (¹⁴N-¹⁵N) band

• The first round involves a heavy (¹⁵N) band and a light (¹⁴N) band, the second round involves a hybrid (¹⁴N-¹⁵N) band.

• The first round involves a heavy (¹⁵N) band and a light (¹⁴N) band, the second round involves a heavy (¹⁵N) band and a light (¹⁴N).

Based on the dispersive model, what are the predicted results from two rounds of replications in the Meselson-Stahl experiment where the initial strands are ¹⁵N and the new strands are ¹⁴N?

• The first round involves a hybrid (¹⁴N-¹⁵N) band, the second round involves a light (¹⁴N) band and a hybrid (¹⁴N-¹⁵N) band

• The first round involves a hybrid (¹⁴N-¹⁵N) band, the second round involves a hybrid (¹⁴N-¹⁵N) band

• The first round involves a heavy (¹⁵N) band and a light (¹⁴N) band, the second round involves a hybrid (¹⁴N-¹⁵N) band.

• The first round involves a heavy (¹⁵N) band and a light (¹⁴N) band, the second round involves a heavy (¹⁵N) band and a light (¹⁴N).

Which of the following did Watson & Crick determine from the image provided by Rosalind Franklin of DNA?

• approximate width of the DNA molecule

• length of one turn of the DNA molecule

• number of nucleotides in the DNA molecule

• nitrogenous bases order in the DNA molecule

What information did Chargaff provide to Watson and Crick to aid in their understanding of base pairing?

• adenine pairs with thymine and guanine pairs with cytosine.

• adenine pairs with guanine and thymine pairs with cytosine.

• adenine pairs with cytosine and guanine pairs with thymine.

• adenine pairs with adenine and thymine pairs with thymine.

Which scientist(s) conclusively proved that DNA was the genetic material for organisms?

• Chargaff

• Watson & Crick (+ Rosalind Franklin)

• Griffith

• Hershey & Chase

• Meselson & Stahl