DNA Structure Review

Which of the following best represents a nitrogen base?

• B
• A
• C
• D
• E

Which of the following best represents a base pair?

• D
• A
• B
• C
• E

After examining the DNA of different organisms, which of the following did Chargaff conclude about the four bases?

• A = T and C = G
• A = C = G = T
• A = C and G =T
• A + T = C + G

What hold the base pairs together?

• magnetism
• hydrogen bonds
• covalent bonds
• Ionic bonds

Which of the following best represents a hydrogen bond?

• E
• A
• B
• C
• D

In eukaryotic cells, DNA is located in the ____ of the cell?

• ribosome
• nucleus
• cell membrane
• golgi apparatus

A nucleotide consists of

• a nitrogen base
• a nitrogen base and a sugar
• a nitrogen base, sugar, and phosphate
• two nitrogen bases, a sugar, and a phosphate

Which of the following best represents a nucleotide?

• C
• A
• B
• D
• E

Watson and Crick are credited with discovering the structure of DNA by combining the work of other scientists with their own. They discovered that the two strands of DNA join together to form a(n)

• nucleotide
• X in a circle
• double helix
• covalent bond

DNA is called the blueprint of life because

• it contains the instructions for building an organism
• it is like a fingerprint
• it has a blue color
• it can relay messages to other molecules