AP Biology Unit 2

The enzyme that unzips the DNA to prepare for replication

• helicase

• replicase

• polymerase

• synthase

In what phase of the cell cycle does DNA replication take place?

• G1

• S

• G2

• M

The process of DNA replication is called semi conservative because it results in

• none of these

• Two DNA molecules.  One original molecule and one with two new strands

• two exact copies with new strands

• two identical molecules, each with 1 original strand and one new.

Which enzyme seals okazaki fragments together on the lagging strand?

• Topoisomerase

• Helicase

• Polymerase

• Ligase

The 5' end of DNA is marked by a(n)

• Phosphate Group

• Hydroxyl Group

• Purine

• Pyrimidine

Tags

NGSS.HS-LS1-1

The two strands of DNA are held together by:

• Hydrogen Bonds

• Phosphodiester Bonds

• Glycolsyl Bonds

• Glycosidic Linkages

The concept that DNA is made of two strands running in opposite directions is called:

• Antiparallel

• Isomerism

• Enantiomerism

• S/R Chirality

Tags

NGSS.HS-LS1-1

Who's work concluded that the %A=%T  and %G=%C

• Chargaff

• Meischer

• Levene

• Hammerling

The new DNA on the leading strand is synthesized in the _________ direction

• 5' to 3'

• 3' to 5'

DNA replication was proved by the experiments of:

• Hershey & Chase

• Meselson & Stahl

• Watson & Crick

• Franklin & Gosling