Chapter 9 Review Assignment

Watson and Crick worked at Cambridge in the 1950s to determine the structure of which molecule?

• RNA

• Protein

• DNA

• Carbohydrate

Who used X-ray crystallography to photograph the structure of DNA?

• Watson and Crick

• Linus Pauling and Maurice Wilkins

• Rosalind Franklin

• All of the above

Chargaff’s rules revealed that nucleotide pairs occur in ______ amounts, hinting at base pairing.

• equal

• random

• unequal

• opposite

In 1962, Watson, Crick, and Wilkins received the Nobel Prize in Medicine for their discovery of the structure of DNA.

• True

• False

Figure 9.2 shows the X-ray diffraction pattern of DNA discovered by which scientist?

• Rosalind Franklin

• James Watson

• Francis Crick

• Maurice Wilkins

What is the shape of DNA?

• Double helix

• Triple helix

• Single strand

• Circular

DNA is made of two strands of ______ running in opposite directions (antiparallel).

• nucleotides

• amino acids

• fatty acids

• monosaccharides

Nucleotides are composed of...

• A phosphate group

• A deoxyribose sugar

• A nitrogenous base

• All of the above

Strands of DNA are held together by ______ bonds between complementary bases.

• hydrogen

• covalent

• ionic

• peptide

DNA is tightly coiled and packed into _______ for efficient storage.

• chromatids
• nucleotides
• chromosomes
• genes