Sc. 30 - DNA Structure and Replication, Protein Synthesis, Mutat

DNA is made up of millions of ________________.

Which of the following is NOT one of the three molecules that makes up a nucleotide?

• phosphate group

• 5 carbon sugar

• nitrogen base

• amino acid

Which molecule is attached to carbon #1 on the five carbon sugar?

• a nitrogen base

• a phosphate group

Which molecule is attached to carbon #5 on the five carbon sugar?

• a nitrogen base

• a phosphate group

The "backbone" of a DNA molecule is made up of...

• the nitrogen bases and the phosphates

• the sugars and the phosphates

• the nitrogen bases and the sugars

The two strands of DNA are help together by the...

• sugars

• phosphates

• nitrogen bases

The nitrogen bases are held together in the middle by ________________ __________ ___________.

The two strands of DNA are twisted into a double ____________.

The first step of DNA replication is...

• The DNA strands are untwisted.

• The new strands are built by complementary base pairing.

• The new DNA strands are retwisted into a helix.

• The DNA strands are unzipped.

The second step of DNA replication is...

• The DNA strands are untwisted.

• The new strands are built by complementary base pairing.

• The new DNA strands are retwisted into a helix.

• The DNA strands are unzipped.