In DNA, the two purines are __________, and the two pyrimidines are ____________.

Question 1    
     In DNA, the two purines are __________, and the two pyrimidines are ____________.
 
   A.    cytosine and thymine...adenine and guanine
   B.    cytosine and guanine...adenine and thymine
   C.    adenine and cytosine...guanine and thymine
   D.    adenine and thymine...cytosine and guanine
   E.    adenine and guanine...cytosine and thymine

Question 2   
     Monomers for the synthesis of DNA are called __________.
 
   A.    nucleotides
   B.    amino acids
   C.    fatty acids
   D.    disaccharides
   E.    monosaccharides

Question 3   
     Telomeres ____________.
 
   A.    get longer with continued cell division
   B.    remain the same regardless of the frequency of cell division
   C.    are found in both prokaryotic and eukaryotic cells
   D.    are shorter for younger individuals
   E.    get shorter with continued cell division

Question 4 
     What enzyme joins Okazaki fragments?
 
   A.    DNA polymerase
   B.    primase
   C.    DNA ligase
   D.    topoisomerase
   E.    helicase

Question 5 
     The role of DNA polymerase in DNA replication is to ___________.
 
   A.    attach free nucleotides to the new strand
   B.    separate the two strands of DNA
   C.    link together short strands of DNA
   D.    synthesize an RNA primer to initiate DNA strand synthesis
   E.    all of the above

Question 6 
     The information in DNA is contained in __________________.
 
   A.    the types of sugars used in making the DNA molecule
   B.    the sequence of amino acids that make up the DNA molecule
   C.    the variation in the structure of nucleotides that make up the DNA molecule
   D.    the sequence of nucleotides along the length of the two strands of the DNA molecule
   E.    all of the above

Question 7   
     The incorporation of an incorrect base into the DNA during replication _________________.
 
   A.    will trigger the cell to destroy the new strand, and replication will begin again
   B.    is virtually impossible, as the accuracy of DNA polymerase is such that errors almost never occur
   C.    cannot be repaired, and a new mutation will invariably result
   D.    can be repaired by the mismatch repair system
   E.    will almost certainly lead to the death of the cell

Question 8   
     Avery and his colleagues' 1944 experiment showed that DNA ______________.
 
   A.    was the substance that transformed the bacteria in Griffith's experiment
   B.    uses three bases to code for one amino acid
   C.    consists of sugars, phosphate groups, and bases
   D.    contains adenine, guanine, thymine, and cytosine
   E.    has two strands held together with hydrogen bonds

Question 9   
     Who is credited with discovering the structure of the DNA double helix?
 
   A.    Hershey and Chase
   B.    Jacob and Monod
   C.    Watson and Crick
   D.    Avery, McCarty, and MacLeod
   E.    Griffith

Question 10   
     The two strands of a DNA double helix are antiparallel. This means that _________________.
 
   A.    one strand runs in the 5' to 3' direction, and the other runs in the 3' to 5' direction
   B.    they both run in the 3' to 5' direction
   C.    only one of the two strands can be used as a template for replication, because DNA polymerase only works in one direction
   D.    the two strands are mirror images
   E.    one strand is actually composed of RNA


Thank You in advance for all of your help.