DNA structure and replication

When does DNA replication occur?

• before cell division

• after cell division

• during cell division

• at any point in the cell cycle

If 30% of the bases in a DNA sequence are thymine, what percentage are adenine?

• 30

• 20

• 40

• 60

If 30% of the bases in a DNA sequence are thymine, what percentage are guanine?

• 30

• 20

• 40

• 60

What type of macromolecule is DNA?

• carbohydrate

• nucleic acid

• protein

• lipid

If a template DNA strand has the sequence AAGCT, what would be the sequence of the newly formed strand?

• TTCGA

• AAGCT

• GGATC

• CCTAG

What are the monomers of DNA called?

• nucleic acids

• nucleotides

• amino acids

• nitrogenous bases

What type of bonds hold the two strands of DNA together between the nitrogenous bases?

• phosphodiester bonds

• phosphate bonds

• covalent bonds

• hydrogen bonds

What type of bonds hold the nucleotides together within a strand of DNA?

• phosphodiester bonds

• ionic bonds

• weak bonds

• hydrogen bonds

Two bases that always pair together in a DNA molecule are called _______ bases.

• semiconservative

• complementary

• pyrimidine

• purine

What is the first step in DNA replication?

• DNA polymerase adds nucleotides to produce a new strand

• helicase unzips DNA double helix

• okazaki fragments are formed

• DNA double helix zips up with hydrogen bonds