Reinforcement DNA Replication

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

• The uptake and incorporation of foreign DNA by a bacterium.
• The ability of bacteria to survive extreme conditions.
• The conversion of bacteria into a different species.
• The process of bacteria reproducing asexually.

Tags

VA.BIO.5.b.

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?

• To determine the role of lipids in genetic material.
• To test the effects of radiation on bacteria.
• To determine whether DNA or protein is the genetic material.
• To identify the structure of bacteriophages.

Tags

VA.BIO.5.b.

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.

• Radioactivity was detected outside bacterial cells when infected by bacteriophages marked with sulfur-35.
• No radioactivity was detected in bacterial cells after infection by bacteriophages marked with phosphorus-32.
• Radioactivity was only detected in the bacteriophages, not in the bacterial cells.
• Radioactivity was detected inside bacterial cells when infected by bacteriophages marked with phosphorus-32.

Tags

VA.BIO.5.b.

If 35% of an organism’s DNA is thymine, what is the percentage of guanine?

• 25%
• 30%
• 20%
• 15%

Tags

VA.BIO.5.a.

Identify the nitrogenous base in the structure.

Tags

VA.BIO.5.a.

According to base pairing rules, adenosine will always pair with​ (a)   and guanine will always pair with ​ (b)   .

• thymine
• cytosine
• uracil
• amino acid

Tags

VA.BIO.5.a.

Match the following DNA replication enzymes.

• Enzyme that synthesizes new DNA strands

• DNA primase

• Enzyme that unwinds the DNA double helix

• DNA ligase

• Enzyme that synthesizes RNA primers

• DNA polymerase

• Enzyme that joins replicated fragments

• DNA helicase

Tags

VA.BIO.5.a.

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

What makes up the rungs of the twisted ladder?

• Pared sugar molecules

• Phosphate groups
• Proteins
• Paired nitrogenous bases

Tags

VA.BIO.5.a.

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

• RNA is a ribonucleic acid

• RNA is single stranded

• RNA is double-stranded like DNA.
• RNA contains thymine instead of uracil.

Tags

VA.BIO.5.a.

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

Select all that apply (hint: 3)

• 
  Paired nucleotides are held together by hydrogen bonds.

• Paired nucleotides are held together by covalent bonds.

• The two strands of DNA each have phosphate-sugar backbones

• The numbers of each nucleotide determine genetic information

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

Tags

VA.BIO.5.a.