What is the shape of the DNA molecule?

• Single helix

• Double helix

• Triple helix

• Quadruple helix

Which components make up a single nucleotide in DNA?

• Sugar, phosphate group, and nitrogenous base

• Sugar, potassium group, and nitrogenous base

• Sugar, phosphate group, and amino acid

• Amino acid, phosphate group, and nitrogenous base

According to Chargaff's rule, which of the following is true?

• A=T and G≠C

• A+T=G+C

• A=T and G=C

• A+G=T+C

Which bases in DNA are considered purines?

• Adenine and Thymine

• Cytosine and Guanine

• Adenine and Guanine

• Thymine and Cytosine

What type of bond holds the two DNA strands together?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Metallic bonds

Which of the following is not a component of a DNA nucleotide?

• Deoxyribose sugar

• Phosphate group

• Ribose sugar

• Nitrogenous base

How many hydrogen bonds are typically formed between Adenine and Thymine?

• 1

• 2

• 3

• 4

How many hydrogen bonds are typically formed between Cytosine and Guanine?

• 1

• 2

• 3

• 4

Which of the following is a pyrimidine found in DNA?

• Adenine

• Guanine

• Cytosine

• Uracil

What is the backbone of the DNA structure made of?

• Nitrogenous bases and hydrogen bonds

• Sugar and nitrogenous bases

• Sugar and phosphate groups

• Phosphate groups and hydrogen bonds