Homework Section 1.1
MAIN IDEA: DNA was identified as the genetic material though a series of experiments.
- 1.
A bacteriophage has two main structures: a DNA molecule and a _________________ coat.
- A.
Protein
- B.
Carbohydrate
- C.
Leather
- D.
Lipids
Correct Answer
A. Protein -
- 2.
In Frederick Griffith's experiments, how did he kill the deadly disease-causing bacterial strain?
- A.
Radioactive isotopes
- B.
Heat
- C.
Smashed them with his hand
- D.
Washed them with chemicals
Correct Answer
B. Heat -
- 3.
Which result of Frederick Griffith’s experiments led him to believe in a“transforming principle”?
- A.
Mice injected with live S bacteria died.
- B.
Mice injected with live R bacteria lived.
- C.
Mice injected with dead S bacteria lived.
- D.
Mice injected with dead S and live R bacteria died.
Correct Answer
D. Mice injected with dead S and live R bacteria died. -
- 4.
An important factor in Oswald Avery’s ability to identify the “transforming principle” as DNA was the fact that proteins
- A.
Contain very little phosphorus.
- B.
Were present in the extract made from S bacteria.
- C.
Do not react with enzymes.
- D.
Could be observed in the extract made from R bacteria.
Correct Answer
A. Contain very little phosphorus. -
- 5.
Chemical analysis of Avery’s extracts showed that the ratio of nitrogen to phosphorus was consistent with that of
- A.
Enzymes.
- B.
DNA
- C.
Protein
- D.
Bacteria
Correct Answer
B. DNA -
- 6.
Hershey and Chase chose to use bacteriophages in their experiments because these viruses
- A.
Contain little more than DNA and protein.
- B.
Can be seen with a light microscope.
- C.
Can infect only bacteria, not humans.
- D.
Will not grow in radioactive culture.
Correct Answer
A. Contain little more than DNA and protein. -
- 7.
As a result of the Hershey and Chase experiments, scientists believe that
- A.
Radioactive isotopes can be used safely.
- B.
Viruses use bacterial DNA to reproduce.
- C.
The “transforming principle” is DNA.
- D.
Bacteriophages can be grown in culture medium.
Correct Answer
C. The “transforming principle” is DNA. -
- 8.
What was “transformed” in Griffith’s experiment?
- A.
Dead R bacteria
- B.
Live R bacteria
- C.
Dead S bactreria
- D.
Live S bacteria
Correct Answer
B. Live R bacteria -
- 9.
One experiment discussed in the text used _________ to break down proteins and RNA.
- A.
Radioactive sulfur
- B.
A kitchen blender
- C.
Enzymes
- D.
Hot water
Correct Answer
C. Enzymes -
- 10.
A bacteriophage is a type of _________________ that infects bacteria.
- A.
Protein
- B.
Enzyme
- C.
Chemical
- D.
Virus
Correct Answer
D. Virus -
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Jul 13, 2014Quiz Edited by
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Jul 12, 2014Quiz Created by
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