DNA Replication

DNA replication occurs during...

• S-phase of interphase

• cytokinesis

• telophase

• prophase

Which are purines?

• adenine & thymine

• cytosine, uracil, and thymine

• guanine & cytosine

• adenine & guanine

Cytosine, uracil and thymine are pyrimidines.

• True

• False

DNA replication is considered

• semi-conservative, with each new double helix containing two new strands

  
  

• semi-conservative, with each new double helix containing one old strand and one new strand

  
  

• conservative, with each new double helix containing two new strands

  
  

• conservative, with each new double helix containing one old strand and one new strand

DNA replication only starts at the ends of a chromosome.

• False

• True

_____ opens and unwinds the DNA while _____ hold the DNA open to prevent re-annealing.

• single stranded binding proteins......helicase

  
  

• helicase......DNA polymerase

  
  

• helicase......single stranded binding proteins

  
  

• DNA polymerase......helicase

  
  

If the sequence of the 5'-3' strand is AAT-GCT-AC, then the complementary sequence has the following sequence:

• 3'-GTA-GCA-TT-5'

  
  

• 3'-TTA-CGA-TG-5'

  
  

• 3'-AAT-GCT-AC-5'

  
  

• 3'-CAT-CGT-AA-5'

Which of the following does the enzyme primase synthesize?

• Okazaki fragments

  
  

• DNA primer

  
  

• phosphodiester linkage

  
  

• RNA primer

"Read up" means that the DNA is read in the _____ direction; while "write down" means that the DNA is built in the _____ direction.

• 3' to 5' ......5' to 3'

  
  

• 5' to 3' ......5' to 3'

  
  

• 3' to 5' ......3' to 5'

  
  

• 5' to 3'...... 3' to 5'

  
  

Okazaki fragments are found on the _____ strand of the DNA.

• leading

  
  

• leading & lagging

  
  

• lagging