DNA, RNA, and Proteins

The enzyme that works to unzip DNA's double helix to begin replication is

• DNA polymerase.

• RNA polymerase.

• DNA ligase.

• DNA helicase.

DNA replication results in two DNA molecules,

• each with one new strand and one original strand.

• one with two new strands and one with two original strands.

• each with two new strands.

• each with two original strands.

Since DNA replication results in 2 new strands of DNA, one side of original DNA, and one new strand, it is referred to as

• semi-permeable.

• semi-conservative.

• semi-replicative.

• semi-transcriptive.

According to Chargaff's rules, which nucleotide is always paired with Adenine in a DNA molecule?

• Thymine

• Guanine

• Cytosine

• Uracil

According to Chargaff's rules, which nucleotide always pairs with Cytosine in a RNA molecule?

• Uracil

• Thymine

• Guanine

• Adenine

According to Chargaff's rules, which nucleotide always pairs with Adenine in an RNA molecule?

• Thymine

• Uracil

• Cytosine

• Guanine

Nitrogen bases with only 1-ring are called

• purines

• pyrimidines

• nucleotides

• nucleosomes

Nitrogen bases with 2 rings are called

• purines.

• pyrimidines.

• nucleotides.

• nucleosomes.

Which of the following are pyrimidines?

• cytosine

• guanine

• adenine

• thymine

A portion of mRNA is coded CUG. The corresponding DNA is coded

• GAC
• GTC
• CTG
• CAG