AP Biology DNA Structure

Which of the following best describes a DNA molecule?

• double helix

• contains ribose

• made of amino acids

• contains Uracil

Tags

NGSS.HS-LS1-1

How do the leading and the lagging strands differ?

• The leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction.

• The leading strand is synthesized at twice the rate of the lagging strand.

• The leading strand is synthesized in short fragments that are ultimately stitched together, whereas the lagging strand is synthesized continuously.

• The leading strand is synthesized by adding nucleotides to the 3' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 5? end.

Which enzyme is responsible for adding nucleotides?

• Topoisomerase

• DNA Polymerase

• Ligase

• Primase

A segment of DNA is shown in the diagram below.

What is the structure labeled "X" in this diagram?

• Nucleotide

• Phosphate group

• Hydrogen Bond

• Deoxyribose

Tags

NGSS.HS-LS1-1

Label the picture in order:

• phosphate ; sugar ; base

• phosphate ; base ; sugar

• base ; sugar ; phosphate

• base ; phosphate ; sugar

Match the letter to the part.

a

b

c

d

e

Hydrogen Bonds

Nitrogen Base

Covalent Bond

Phosphate

Deoxyribose Sugar

Tags

112.42.c.7.A

The sides of the DNA “Ladder” are made up of:

• Alternating phosphates and sugars

• Nitrogen bases

• Hydrogen bonds

• Protein chains

Which of the following units are repeatedly joined together to form a strand of DNA?

• amino acids

• nucleotides

• fatty acids

• polysaccharides

In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of

• cytosine

• guanine

• thymine

• uracil

Nitrogenous bases are joined by which type of bond?

• polar bonds

• ionic bonds

• covalent bonds

• hydrogen bonds

Tags

NGSS.HS-LS1-1