Exploring the Fundamentals of DNA Structure

What are the three components of a nucleotide?

• A phosphate group, a sugar molecule, and a nitrogen base

• A phosphate group, a lipid molecule, and a nitrogen base

• A sugar molecule, a lipid molecule, and a nitrogen base

• A phosphate group, a sugar molecule, and a protein

What forms the double backbone of the DNA molecule?

• Protein chains

• Nitrogen bases

• Hydrogen bonds

• Sugar-phosphate bonds

Which nitrogen base pairs with adenine in DNA?

• Cytosine

• Guanine

• Thymine

• Adenine

How do nitrogen bases link up in DNA?

• Using covalent bonds

• Using ionic bonds

• Using hydrogen bonds

• Using metallic bonds

What varies greatly from one species to the next in DNA?

• The number of strands

• The order of base pairs along each strand

• The type of phosphate group

• The type of sugar molecule