DNA Structure and Function Worksheet

Why is DNA described as "double stranded"?

• Because it consists of two strands twisted together

• Because it is found in two types of cells

• Because it has two types of bases

• Because it is made of two different molecules

Tags

NGSS.HS-LS1-1

What are the three main components that make up a DNA nucleotide?

• Deoxyribose, phosphate group, nitrogenous base

• Ribose, phosphate group, uracil

• Glucose, phosphate group, nitrogenous base

• Deoxyribose, sulfur group, nitrogenous base

Explain why each part of a nucleotide (phosphate, deoxyribose sugar, and base) is essential for the structure and function of DNA.

• Each part contributes to the stability, backbone, and coding properties of DNA.

• Only the base is important for DNA function.

• The sugar and phosphate are not necessary for DNA structure.

• The phosphate group is only for energy storage.

Tags

NGSS.HS-LS1-1

If a DNA molecule contains a sequence with the base adenine, which of the following bases will it pair with?

• Thymine

• Guanine

• Cytosine

• Adenine

Which of the following is a pyrimidine found in DNA?

• Thymine

• Adenine

• Guanine

• Uracil

Guanine belongs to which class of nitrogenous bases?

• Purines

• Pyrimidines

• Amino acids

• Carbohydrates

According to the base-pair rule, which nitrogenous base pairs with adenine in DNA?

• Thymine

• Guanine

• Cytosine

• Uracil

How are the sugar and phosphate molecules bonded together in the DNA backbone?

• Covalent bonds

• Hydrogen bonds

• Ionic bonds

• Peptide bonds

Which pairs of bases in DNA can form hydrogen bonds with each other?

• Adenine and Thymine, Guanine and Cytosine

• Adenine and Guanine, Thymine and Cytosine

• Adenine and Cytosine, Guanine and Thymine

• Thymine and Guanine, Adenine and Cytosine

What type of bond is responsible for holding together the base pairs in the structure of DNA?

• Ionic bond

• Hydrogen bond

• Covalent bond

• Metallic bond