BIOL190 - Exam 3

Before complementary base pairing can occur in DNA replication, ________.

•  

  heat must be applied to separate the two strands

  
  

•  

  the DNA molecule must be unwound and separated

  
  

•  

  the DNA molecule must be totally disassembled

  
  

•  

  cold must be applied to separate the two strands

  
  

In order for a pre-mRNA to be converted into an mRNA which of the following usually occurs?

•  

  removal of 5’ cap and poly-A tail

  
  

•  

  All of these are required

  
  

•  

  removal of introns

  
  

•  

  removal of exons

  
  

In the space provided, build the complementary mRNA strand that corresponds to the DNA strand. NO SPACES, ONLY LETTERS

G T A C G T

In DNA replication on the leading strand

•  

  Is synthesized continuously

  
  

•  

  Is synthesized discontinuously

  
  

•  

  Contains many primers

  
  

•  

  Is composed of Okazaki fragments

  
  

In a DNA molecule, the nitrogenous bases, deoxyribose sugars, and the phosphate head are linked together via covalently bond

• True

• False

For DNA replication to begin on the leading strand 

•  

  Primase must add a RNA primer

  
  

•  

  Primase must add a DNA primer

  
  

•  

  Nuclease must add and RNA primer

  
  

•  

  Topoisomerase must add an RNA primer

  
  

In order for DNA to be copied, this must first be attached to the template strands at an origin of replication

• Primer

• Operon

• Anticodon

• Start Codon

DNA replication is called semiconservative because ________.

•  

  no extra nucleotides are incorporated into the replicated DNA molecules

  
  

•  

  no extra nucleotides are incorporated into the replicated DNA molecules

  
  

•  

  one of the resulting DNA molecules is composed of the original molecule and the other is made of two new strands of nucleotides

  
  

•  

  the two resulting DNA molecules each have a strand from the original DNA molecule

  
  

During DNA Replication, this enzyme unzips and separates the two strands of DNA

• Helicase

• Ligase

•  

  DNA polymerase

  
  

• Primase

What is the function of topoisomerase?

•  

  stabilizing single stranded DNA

  
  

•  

  relieving strain in the DNA when its being separated

  
  

•  

  unwinding the double helix

  
  

•  

  elongate the new DNA strand