DNA Replication

Enzyme that unwinds the DNA

• ligase
• DNA Polymerase
• primase
• helicase

Seals the Okazaki fragments together

• DNA Polymerase
• ligase
• helicase
• primase

Adds nucleotides to the newly synthesized strand of DNA

• DNA polymerase I
• DNA polymerase III
• Primase
• Ligase

synthesizes a short fragment of RNA that allows DNA polymerase III to bind

• ligase
• DNA polymerase I
• primase
• helicase

removes the RNA primer and adds DNA nucleotides to fill in the gap

• DNA polymerase III
• ligase
• primase
• DNA polymerase I

direction new nucleotides are synthesized on the new strand

• 5^' to 3' (new nucleotides added to the 3' end)

• 3' to 5' (new nucleotides added to the 5' end)

• 3' to 5' (new nucleotides added to the 3' end)

• 5^' to 3' (new nucleotides added to the 5' end)

Replicate the following strand of DNA: 
AATCATGGA

• AATCATGGA
• TTAGTACCT
• UUAGUACCU
• GGATAUCUA

What are the three components of a nucleotide?

• sugar, hydrogen, nitrogen base

• sugar, oxygen, nitrogen base

• sugar, phosphate, nitrogen base

• sugar, phosphate, protein

If a DNA molecule is 18% Guanine which of the following is correct

• 18% cytosine, 32% adenine, 32% thymine
• 32% cytosine, 18% adenine, 32% thymine
• 18% cytosine, 64% adenine, 64% thymine
• 32% cytosine, 32% adenine, 18% thymine

When DNA replicates, each strand of the original DNA molecule is used as a template for the synthesis of a second, complementary strand. Which of the following figures most accurately illustrates enzyme-mediated synthesis of new DNA at a replication fork?

• A

• B

• C

• D