Chapter 13 Test - DNA

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.

• Bacteriophages inject DNA into the bacterial cells.
• Bacteriophages inject protein into the bacterial cells.
• Bacteriophages inject carbohydrates into the bacterial cells.
• Bacteriophage absorb DNA from bacterial cells.

Chargaff's rules of base pairing are explained by which structural feature of DNA?

• Each strand of DNA contains a phosphate and sugar backbone.
• The nucleotides of DNA may appear in a wide variety of sequences.
• DNA is double stranded, and covalent bonds between identical nucleotides hold the strands together.
• DNA is double stranded, and hydrogen bonds between base pairs hold the strands together.

When must DNA replication occur during the cell cycle for each daughter cell to receive a complete copy of DNA?

• DNA replication must occur before mitosis.
• DNA replication must occur during mitosis
• DNA replication must occur during G2.
• DNA replication must occur during G1.

How does DNA replication differ between eukaryotes and prokaryotes?

• The base-pairing rules are different between eukaryotes and prokaryotes.
• Only prokaryotes rely on enzymes such as DNA polymerase.
• Only eukaryotes rely on enzymes such as DNA polymerase.
• Eukaryotes use multiple replication forks to replicate a larger volume of DNA.

Hershey and Chase chose to use bacteriophages in their experiments because these viruses

• contain little more than DNA and protein.
• can be seen with a light microscope.
• can infect only bacteria, not humans.
• will not grow in radioactive culture.

The four types of nucleotides that make up DNA are named for their

• hydrogen bonds.
• nitrogen-containing bases.
• phosphate groups.
• ring-shaped sugars.

What holds base pairs together?

• hydrogen bonds
• sugar-phosphate backbones
• pairs of double-ringed nucleotides
• nitrogen-carbon bonds

In humans, where does DNA replication take place?

• cytoplasm
• ribosome
• nucleus
• vacuole

During replication, the function of the enzyme DNA polymerase is to

• bind nucleotides together.
• send messages.
• receive messages.
• locate replication sites.

What is the shape of DNA?

• Twisted Ladder

• Double Helix

• Helix

• Ladder