Chapter 13 Lesson 1 Quiz

Which scientists discovered transformation in his experiments on mice and Pneumococcus bacteria?

• Griffith

• Avery

• Hershey

• Chase

Which combination of bacteria killed the mice and showed that transformation occurred?

• heat-killed R strain and S strain

• heat-killed S-strain and live R-strain

• heat-killed bacteria of both strains

• live bacteria of both strains

Avery and other scientists extracted a mixture of molecules from heat-killed bacteria. They found that transformation no longer occurred when they treated the mixture with enzymes that destroyed _________. This experiment supports the hypothesis that _______ is the genetic material.

• DNA, DNA

• protein, protein

• RNA, protein

• carbohydrates, RNA

True or False. A bacteriophage is a type of virus that infects a bacteria.

• True

• False

True or False. A bacteriophage is a virus consisting of a protein coat and a DNA core.

• True

• False

Hershey and Chase labeled the bacteriophage with radioactive markers. What was the purpose of marking the bacteriophages with phosphorus-32 and sulfur-35?

• to track the movements of DNA and sugars

• to track the movements of DNA and proteins

• to remove DNA and sugars from the bacteriophages

• to combine DNA and proteins into a single molecule

True or False. DNA must instruct cells to produce needed molecules.

• True

• False

Which of the following are tasks that DNA must be able to perform in all organism?

• It must store genetic informaiton

• It must discard foreign genes

• It must copy itself

• It must move to locations throughout the cell

When does transformation occur?

• when bacteria are killed with heat

• when a cell receives foreign DNA that is expressed as a new characteristic