BIO 110, Quiz #9: DNA

Multiple Choice: Identify the choice that best completes the statement or answers the question.

 

____ 1. DNA contains ____ but NOT ____.

a.

sulfur; phosphorus

b.

phosphorus; sulfur

c.

potassium; sulfur

d.

sulfur; potassium

e.

proteins; phosphorus

 

 

____ 2. If a mixture of bacteriophages, some labeled with radioactive sulfur and others labeled with radioactive phosphorus, is placed in a bacterial culture, the bacteria will eventually contain

a.

radioactive sulfur.

b.

radioactive phosphorus.

c.

both radioactive sulfur and phosphorus.

d.

neither radioactive sulfur nor radioactive phosphorus.

e.

complete viruses with radioactive sulfur coats.

 

 

____ 3. The experiments of which of the following researchers clearly distinguished DNA and NOT protein as the hereditary material?

a.

Pauling

b.

Hershey and Chase

c.

Griffith

d.

Watson and Crick

e.

Avery

 

 

____ 4. DNA contains all of the following nitrogen-containing bases EXCEPT

a.

adenine.

b.

uracil.

c.

guanine.

d.

adenine.

e.

thymine.

 

 

____ 5. Adenine and guanine are

a.

double-ringed purines.

b.

single-ringed purines.

c.

double-ringed pyrimidines.

d.

single-ringed pyrimidines.

e.

nucleotides.

 

 

____ 6. Which scientist(s) discovered the basis for the base-pair rule, which states that the amounts of adenine and thymine match, as do the amounts of cytosine and guanine?

a.

Avery

b.

Griffith

c.

Chargaff

d.

Hershey and Chase

e.

Pauling

 

 

____ 7. If one DNA strand is a 5 to 3, the DNA strand complemetary to it will

a.

also run in the 5 to 3 direction.

b.

be a 5 to 5 strand.

c.

be a 3 to 3 strand.

d.

run in the opposite direction, 3 to 5.

e.

alternate between 5 to 3 segments and 3 to 5 segments

 

 

____ 8. If all of the hydrogen bonds in a DNA molecule were to break,

a.

the nucleotide base pairs would separate from each other.

b.

base pairing would not be affected.

c.

the phosphate groups would separate from the deoxyribose sugars.

d.

the deoxyribose sugars would separate from the nitrogen-containing bases.

e.

the molecule would unwind, but the two strands would stay together.

 

 

____ 9. In the spiral staircase model of DNA, the rungs are

a.

deoxyribose sugars.

b.

hydrogen bonds.

c.

nucleotide base pairs.

d.

phosphate groups.

e.

composed of all of these.

 

 

____ 10. DNA replication is

a.

redundant.

b.

semiconservative.

c.

progressive.

d.

conservative.

e.

repetitive.

 

 

____ 11. DNA polymerase assembles new strands

a.

in a 5' to 3' direction only.

b.

in a 5' to 3' direction building one strand and a 3' to 5' direction building the other stand.

c.

in a 5' to 3' direction building the first half of a strand and a 3' to 5' direction building the second half of a strand.

d.

in a 3' to 5' direction building the first half of a strand and a 5' to 3' direction building the second half of a strand.

e.

in a 3' to 5' direction on the "old" 3' to 5' strand.

 

 

____ 12. The function of helicase enzymes is to

a.

break hydrogen bonds and unwind the two strands of the DNA molecule prior to replication.

b.

rewind the two DNA molecules after replication.

c.

remove bases that might have been inserted incorrectly.

d.

seal new short stretches of nucleotides into one continuous strand.

e.

fragment old DNA that is no longer of use to the cell.