DNA Replication

What enzyme is responsible for replicating DNA?

• RNA polymerase

• helicase

• DNA polymerase

• Ribosomes

Answer explanation

RNA polymerase - makes RNA (not DNA)

Helicase - unzips DNA hydrogen bonds

Ribosomes - Read mRNA to make proteins

When DNA is replicated, the result is

• 1 old double helix and 1 new

• 2 double helixes. Each with 1 old and 1 new strand

• 1 double helix

• 2 new double helixes

Replicate this strand:

ACCGGATT

• TCCGGATT

• AGGCCTAA

• TGGCCTAA

• CCGGAATT

Answer explanation

A becomes T

C becomes G

What does helicase break?

• ionic bonds

• hydrogen bonds

• hearts

• legs

Answer explanation

What part of the cell cycle does replication occur?

• S phase

• Prophase

• Metaphase

• G1

order of replication

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

A process in which DNA has the unique ability to make an exact copy of itself.

• Replication
• Translation
• Transcription

Enzyme that breaks hydrogen bonds (unzips)

• Ligase

• Polymerase

• Primase

• Helicase

The new DNA strand formed after DNA replication is an exact copy of its parent strand

• True

• False

What is the shape of DNA?

• Double helix
• Triple helix
• Flat, bilayer
• Three-pronged rigid ladder