Tuesday, December 24, 2013
What catalyzes DNA synthesis?
This enzyme catalyzes DNA synthesis.
Which of the following statements about DNA synthesis is true?
As DNA polymerase moves along the template strand, each new nucleotide provides a 5’ hydroxyl group for the next reaction to occur.
Primers are short sequences that allow the initiation of DNA synthesis.
DNA polymerase adds dNTP monomers in the 3’ to 5’ direction.
Nucleotides are added in a random fashion to single-stranded DNA.
When a primer is added to a single strand of DNA, DNA polymerase can start adding nucleotides to synthesize a complementary strand.
Which part of a deoxynucleoside triphosphate (dNTP) molecule provides the energy for DNA synthesis?
Free 3' hydroxyl (–OH) group
The potential energy stored in the bonds of the phosphates provides the energy for DNA synthesis.
Which of the following enzymes creates a primer for DNA polymerase?
This RNA polymerase synthesizes an RNA primer antiparallel to the template DNA strand.
Which of the following statements about Okazaki fragments in
They are formed on the lagging strand of DNA.
They are usually 50 to 500 bases long.
They are synthesized in the 3’ to 5’ direction.
They are sealed together by the action of helicase.
While DNA is synthesized continuously on the leading strand, Okazaki fragments are formed on the lagging strand because DNA synthesis always proceeds in the 5’ to 3’ direction.
Which of the following enzymes is important for relieving the tension in a helix as it unwinds during DNA synthesis?
Single-stranded binding proteins
This enzyme untwists the coils that occur in the DNA as it is being unwound into a single-stranded template.
True or false? Single-stranded DNA molecules are said to be antiparallel when they are lined up next to each other but oriented in opposite directions.
When the 3’ end of one DNA strand points in the same direction as the 5’ end of the other DNA strand, the strands are said to be antiparallel.
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