Quiz about Reinforcement DNA Replication

Question 1

Frederic Griffith used the word transformation to describe the changes in bacteria that he observed. Which is the most useful definition of transformation?

Accepted Answer

The uptake and incorporation of foreign DNA by a bacterium.

Answer

The ability of bacteria to survive extreme conditions.

Answer

The conversion of bacteria into a different species.

Answer

The process of bacteria reproducing asexually.

Question 2

In the Hershey-Chase experiment, the components of bacteriophages were labeled with radioactive isotopes of sulfur and phosphorus. What was the Hershey-Chase experiment designed to determine?

Accepted Answer

To determine whether DNA or protein is the genetic material.

Answer

To determine the role of lipids in genetic material.

Answer

To test the effects of radiation on bacteria.

Answer

To identify the structure of bacteriophages.

Question 3

The result of the Hershey-Chase experiment was that radioactivity could be detected inside the bacterial cells when they were infected by bacteriophages marked with phosphorus-32.

Accepted Answer

Radioactivity was detected inside bacterial cells when infected by bacteriophages marked with phosphorus-32.

Answer

Radioactivity was detected outside bacterial cells when infected by bacteriophages marked with sulfur-35.

Answer

No radioactivity was detected in bacterial cells after infection by bacteriophages marked with phosphorus-32.

Answer

Radioactivity was only detected in the bacteriophages, not in the bacterial cells.

Question 4

DNA's double helix is often compared to a twisted ladder.

What makes up the rungs of the twisted ladder?

Accepted Answer

Paired nitrogenous bases

Answer

Pared sugar molecules

Answer

Phosphate groups

Answer

Proteins

Question 5

All of the following are ways in which RNA is different than DNA, except

Accepted Answer

RNA is double-stranded like DNA.

Answer

RNA is a ribonucleic acid

Answer

RNA is single stranded

Answer

RNA contains thymine instead of uracil.

Question 6

What aspects of the structure of DNA are explained by this model?

Select all that apply (hint: 3)

Accepted Answer

Paired nucleotides are held together by hydrogen bonds.

Accepted Answer

The two strands of DNA each have phosphate-sugar backbones

Accepted Answer

Adenine is paired with thymine, and guanine is paired with cytosine.

Answer

Paired nucleotides are held together by covalent bonds.

Answer

The numbers of each nucleotide determine genetic information

Question 7

Griffith investigated how certain types of bacteria produce pneumonia in mice. The diagram outlines his experiments.

What did Griffith conclude from these experiments?

Accepted Answer

The heat-killed S type bacteria transformed the harmless R type bacteria into disease-causing cells.

Answer

The S type bacteria produced a poison that made mice sick.

Answer

The heat-killed S type bacteria became harmless when injected into the mice along with the R type bacteria.

Answer

The R type bacteria produced a poison that caused disease in mice.

Question 8

The table shows data Chargaff collected on DNA nitrogenous bases in five organisms.

Which statement did Chargaff conclude based on these data? Note that a letter in brackets, such as [A] or [C], refers to the concentration of one of the nitrogenous bases.

Accepted Answer

in DNA molecules, [A] = [T], and [C ] = [G]

Answer

in DNA molecules, [T] > [A] > [G] > [C]

Answer

in DNA molecules [A] = [G], and [C ] = [T]

Answer

in single-stranded DNA molecules, [A] = [T] = [C ] = [G]

Reinforcement DNA Replication

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