B.12.3 The Replication of DNA

Each new DNA molecule has:

• two new strands

• one new strand, one original strand

• two original strands

• strands that are mixed up

Tags

NGSS.HS-LS3-2

DNA replication is

• conservative

• semi-conservative

• dispersive

• random

Adds new nucleotides to build new strand

• primase

• DNA polymerase

• ligase

• helicase

• telomerase

Determines point at which replication should start

• primase

• DNA polymerase

• ligase

• helicase

• telomerase

Protects the ends of the DNA strand so that nothing is lost

• primase

• DNA polymerase

• ligase

• helicase

• telomerase

Unzips the DNA molecule

• primase

• DNA polymerase

• ligase

• helicase

• telomerase

Puts the fragments of new DNA together

• primase

• DNA polymerase

• ligase

• helicase

• telomerase

DNA is replicated

• in the 3' to 5' direction

• in the 5' to 3' direction

• in any direction

• randomly

5' to 3' or 3' to 5' refers to:

• the shape

• the code in the new strands

• the type of DNA polymerase needed

• the orientation of the 5-carbon sugar

The strands in a DNA molecule are:

• held together by hydrogen bonds between base pairs

• antiparallel

• parallel

• complementary

• made of proteins