DNA and its Structure

The sugar in DNA is called ____________.

• deoxyribose

• ribose

• phosphate

• Adenine

A nucleotide consists of a nitrogen base, phosphate group, and what other part?

• sugar

• ribose

• adenine

• cytosine

Which nitrogen base pairs with cytosine?

• guanine

• adenine

• thymine

• cytosine

In a DNA molecule, the nitrogen base adenine always bonds with what other nitrogen base?

• thymine

• adenine

• cytosine

• guanine

Which base-pair rules apply to the double helix structure? (Select All That Apply)

• A-T

• C-G

• A-C

• G-A

Which molecule contains genes and makes up our chromosomes?

• DNA

• Phosphate

• Deoxyribose

• Adenine

The "backbone" of the DNA molecule consists of what molecule(s)? (Select all that apply)

• phosphate

• deoxyribose

• Adenine

• Thymine

The two strands of DNA are held together by chemical bonds between the ________.

• nitrogen bases

• phosphate

• deoxyribose

• adenine

DNA is the material that makes up our ____________________.

• chromosomes

• Nucleus

• Cells

• Bodies

A and T, and G and C, in DNA are known as ____________________.

• base pairs

• a double helix

• single strand

• double strand