DNA Replication

A DNA nucleotide contains all of the following, except...

• Deoxyribose
• Phosphate group
• Nitrogenous base
• Cholesterol

DNA replication turns two strands of DNA into four strands of DNA. What percent of DNA is original and new?

• Half of each molecule is new DNA and half is the old DNA

• All the DNA is new, because the old DNA was digested by enzymes

• The new DNA is entirely made up of the old DNA
• About every sixth base comes from the old DNA

Why does DNA need to replicate/be copied?

• To create another copy for a new cell

• To create a duplicate copy in case the original gets damaged

• To make sure its cell friends can get an A on the test also

The picture below shows an enzyme unwinding and unzipping DNA.

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​What is the name of this enzyme?

• DNA Helicase

• DNA Ligase

• DNA polyermase

• RNA Polymerase

Which is the first step?

• DNA Helicase unwinds original DNA strand

• RNA Primase lays down RNA primer for new nucleotide bases.

• DNA polymerase builds new strands by bring in new nucleotide bases.

• Ligase knits together fragments on lagging strand

Which enzyme has the job of unzipping the double helix?

• Helicase
• Polymerase
• Ligase
• Primerase

Which sequence of DNA bases would pair with this partial strand
CAT TCA CTG

• ATG TGA CAG
• TAC ACT GTC
• GTA AGT GAC
• CAT TCA CTG

order of replication

• 3, 4, 2, 1
• 3, 1, 4, 2
• 2, 1, 4, 3
• 3, 4, 1, 2

Place the following in sequential order
1. Recoil
2. Straightens the double helix
3. Breaks Hydrogen bonds
4. Adds Free nucleotides

• 1, 2, 3, 4
• 3, 4, 2, 1
• 3, 2, 4, 1
• 2, 3, 4, 1

If the original strand has the base order of ACCA, what will the new strands base order be?

• TGGT

• ACCA

• GTTG

• CAAC