Chapter 11: DNA Test

Untitled Question Frederic Griffith discovered transformation in his experiments on mice and Pneumococcus bacteria. He injected the mice with combinations of harmless, R-strain bacteria and disease-causing S-strain bacteria. Which combination of bacteria killed the mice and showed that transformation occurred?

• heat-killed R-strain and live S-strain
• heat-killed S-strain and live R-strain
• heat-killed bacteria of both strains
• live bacteria of both strains

Which statements describe a bacteriophage? Select all that apply.

• It is a type of virus that infects bacteria.
• It is a type of bacteria that infects viruses.
• It is a virus consisting of a protein coat and a DNA core.
• It is a bacterial strain consisting of protein and a DNA core.

Bacteriophages are

• viruses
• bacteria
• prions
• viriods

Transformation is

• Formation of DNA from DNA
• Formation of mRNA from DNA
• Genetic alteration of a cell
• Foreign DNA entryby Virus

Why did mice die with R strain was mixed with heat killed S strain?

• the R strain took in the DNA of the heat killed S to become live S
• the heat killed S strain took in the DNA of the R strain to become live S again
• the live S strain took in the DNA of the R strain and became live R

What did Griffith discover?

• DNA
• Transformation
• Bacteria
• Cure for pneumonia

In short, how did Avery's experiments differ from those of Griffith?

• Avery used viruses instead of bacteria
• Avery performed the same experiments but he selectively removed specific organic molecules each time to determine which of them was the transforming molecule.
• Avery performed very similar experiments but he infected a different organism rather than mice.
• Avery's experiments were inconclusive whereas Griffith's definitely showed that DNA was the genetic material.

What are DNA nucleotides made of?

• Sugar, Phosphate, nitrogen base
• Thymine, Adenine, Cytomine
• Phosphate, Adenine, nitrogen base
• Phosphate, Nitrogen, Adenine

Adenine bonds with ______________.

• Guanine
• Thymine
• Adenine
• Cytosine

Which 2 molecules forms the sides (backbone) of the DNA ladder?

• deoxyribose and adenine
• deoxyribose (sugar) and phosphate
• deoxyribose and a hydrogen bond
• sugar and the nucleus