DNA Structure Quiz

In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of

• cytosine

• guanine

• thymine

• uracil

What shape does the DNA molecule resemble?

• A single-stranded helix

• A double helix

• A triple helix

• A linear chain

Which components make up a single nucleotide in DNA?

• Phosphate group, sugar, and nitrogenous base

• Phosphate group and nitrogenous base only

• Sugar and nitrogenous base only

• Phosphate group, sugar, and amino acid

Which sugar is found in the nucleotides of DNA?

• Ribose

• Glucose

• Deoxyribose

• Fructose

According to the base pairing rules in DNA, which base pairs with Adenine?

• Guanine

• Cytosine

• Thymine

• Uracil

How many hydrogen bonds are formed between Adenine and Thymine?

• One

• Two

• Three

• Four

Which base is NOT found in DNA?

• Adenine

• Cytosine

• Uracil

• Guanine

What type of bond holds the two DNA strands together?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Peptide bonds

How many strands make up the DNA molecule?

• One

• Two

• Three

• Four

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

• It forms the genetic code.

• It connects the sugar of one nucleotide to the sugar of another.

• It pairs the bases together.

• It protects the DNA molecule.