DNA Structure Post-Assessment

What is the basic unit of DNA?

• Amino acid
• Protein
• Gene
• Chromosome
• Nucleotide

If a DNA sample has 40% guanine, what percentage of cytosine does it have?

• 10%
• 50%
• 20%
• 30%
• 40%

What are the three main components of a nucleotide?

• Phosphate group, sugar, nitrogenous base

• Amino acids, fatty acids, glycerol
• Carbohydrates, proteins, lipids
• Hydrogen, oxygen, carbon
• Nucleic acids, enzymes, vitamins

Which nitrogen bases always pair together in DNA?

• A with G

  C with T

• A with C

  G with T

• A with A

  C with T

• G with G

  T with T

• A with T

  C with G

What type of bond holds the nitrogen bases together?

• Van der Waals forces
• Metallic bonds
• Covalent bonds
• Hydrogen bonds
• Ionic bonds