Homework Section 1.1

1. A bacteriophage has two main structures: a DNA molecule and a _________________ coat.

Protein

Carbohydrate

Leather

Lipids

2. 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.

3. In Frederick Griffith's experiments, how did he kill the deadly disease-causing bacterial strain?

Radioactive isotopes

Heat

Smashed them with his hand

Washed them with chemicals

4. Chemical analysis of Avery's extracts showed that the ratio of nitrogen to phosphorus was consistent with that of

Enzymes.

DNA

Protein

Bacteria

5. Which result of Frederick Griffith's experiments led him to believe in a"transforming principle"?

Mice injected with live S bacteria died.

Mice injected with live R bacteria lived.

Mice injected with dead S bacteria lived.

Mice injected with dead S and live R bacteria died.

6. An important factor in Oswald Avery's ability to identify the "transforming principle" as DNA was the fact that proteins

Contain very little phosphorus.

Were present in the extract made from S bacteria.

Do not react with enzymes.

Could be observed in the extract made from R bacteria.

7. One experiment discussed in the text used _________ to break down proteins and RNA.

Radioactive sulfur

A kitchen blender

Enzymes

Hot water

8. What was "transformed" in Griffith's experiment?

Dead R bacteria

Live R bacteria

Dead S bactreria

Live S bacteria

9. As a result of the Hershey and Chase experiments, scientists believe that

Radioactive isotopes can be used safely.

Viruses use bacterial DNA to reproduce.

The “transforming principle” is DNA.

Bacteriophages can be grown in culture medium.

10. A bacteriophage is a type of _________________ that infects bacteria.

Protein

Enzyme

Chemical

Virus

Homework Section 1.1

1. A bacteriophage has two main structures: a DNA molecule and a _________________ coat.

2.

What first name or nickname would you like us to use?

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

3. In Frederick Griffith's experiments, how did he kill the deadly disease-causing bacterial strain?

4. Chemical analysis of Avery's extracts showed that the ratio of nitrogen to phosphorus was consistent with that of

5. Which result of Frederick Griffith's experiments led him to believe in a"transforming principle"?

6. An important factor in Oswald Avery's ability to identify the "transforming principle" as DNA was the fact that proteins

7. One experiment discussed in the text used _________ to break down proteins and RNA.

8. What was "transformed" in Griffith's experiment?

9. As a result of the Hershey and Chase experiments, scientists believe that

10. A bacteriophage is a type of _________________ that infects bacteria.