Test 8
1. The following statements about restriction endonucleases 
     is true EXCEPT:

a. they cut DNA at defined sequences.
b. they are natural products of bacteria.
c. they cut only single-stranded DNA molecules.
d. they are so named because they restrict the growth of 

e. they cut sugar-phosphate backbones of the DNA without 
    damaging the nitrogenous bases. 
2. DNA differs from RNA in:

a. the presence of uracil in RNA in place of thymidine in DNA.

b. the presence of 3' deoxyribose in DNA, ribose in RNA.

c. the presence of guanine in DNA in place of cytosine in DNA.

d. the occurrence of base pairing in DNA but not RNA.

e. the presence of 5' phosphate in DNA but not RNA.

3. The mutation that is most likely to lead to premature
     termination of translation is:
a. deletion of three bases from DNA.
b. insertion of single base into an extron of a DNA.
c. insertion of single base into an intron of a DNA.
d. single base change in a promoter.
e. deletion of an entire gene.
4. The northern blot is a technique used in molecular biology 
     research to study :
a. single-stranded DNA.
b. double-stranded DNA.
c. RNA.
d. mitochondrial DNA.
e. ribosomes.
5. The chromosomes line up at the equator of the cell
     at which phase of the mitosis:
a. interphase
b. prophase
c. metaphase
d. anaphase
e. telephase
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