Understanding the Structure of DNA

What is the shape of the DNA molecule?

• Single helix

• Double helix

• Triple helix

• Linear strand

Which of the following base pairs are found in DNA?

• Adenine and Uracil

• Cytosine and Guanine

• Thymine and Uracil

• Guanine and Uracil

What type of bond holds the two strands of DNA together?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Metallic bonds

What is the pentose sugar component of DNA?

• Ribose

• Deoxyribose

• Glucose

• Fructose

In DNA, adenine pairs with which other base?

• Cytosine

• Guanine

• Thymine

• Uracil

Which of the following is a purine base found in DNA?

• Thymine

• Cytosine

• Adenine

• Uracil

What is the function of the phosphate group in the DNA structure?

• To store genetic information

• To provide structural support

• To form the backbone of the DNA strand

• To pair with nitrogenous bases

Which of the following is a pyrimidine base found in DNA?

• Guanine

• Adenine

• Uracil

• Cytosine

Which bond joins nucleotides of a single DNA strand together?

• Phosphoester

• Ester

• Phosphodiester

• Diester

What is the name of the polymer formed of two or more nucleotides?

• Polynucleotide

• DNA strand

• Sugar-phosphate backbone

• Dinucleotide