AP Biology 2nd Semester Final Exam

Genetic information is stored in and passed to subsequent generations through what molecule(s)

• DNA only

• RNA only

• DNA and sometimes RNA

Which is NOT correct according to base pair rules?

• Adenine - Thymine

• Cytosine - Guanine

• Adenine - Guanine

• Adenine - Uracil

Adenine and Guanine have a double ring structure, so they are called what?

• Pyrimidines

• Purines

• Puritans

What type of bond holds nitrogen bases to one another forming the "rungs" of the DNA ladder?

• Covalent

• Hydrogen

• Ionic

• Phosphodiester

Which of the following best describes the DNA molecules produced by replication

• One DNA molecule with two original strands, and a second DNA molecule with two new strands

• Two DNA molecules, each containing one original strand and one new strand

In DNA Replication, which enzyme helps synthesize new strands of DNA?

• Helicase

• Topoisomerase

• DNA Polymerase

• Ligase

In DNA Replication, which enzyme unwinds the DNA strands?

• Helicase

• Topoisomerase

• DNA Polymerase

• Ligase

In DNA Replication, which enzyme joins the fragments on the lagging strand?

• Helicase

• Topoisomerase

• DNA Polymerase

• Ligase

In DNA Replication, relaxes supercoiling in front of the replication fork?

• Helicase

• Topoisomerase

• DNA Polymerase

• Ligase

When DNA replicates, one strand is formed continuously while the other strand is formed in fragments because new nucleotides can only be added to the _______ end of DNA

• 3'

• 5'

• 7'

• 9'