DNA Structure

A nucleotide is made of three parts

• phosphate group

• Deoxyribose sugar

• gene

• nitrogenous base

What is the name of sugar in DNA

• Adenine

• nitrogen base

• Deoxyribose

DNA is a helix shape

• false

• true

DNA is made of four strands

• True

• False

Strands in DNA are twisted around each other like the coils of

a spring, a shape known as a

If a twisted ladder is used as a model of DNA, which parts

of a DNA molecule correspond to the sides of the ladder?

• phosphate group

• nitrogenous base

• deoxyribose

• helix

Which parts of a DNA

molecule correspond to the rungs

of the ladder?

• hydrogen bonds

• nitrogenous base pairs

• ribosome

The two strands in a DNA molecule run in the SAME directions

• true

• false

The basic building blocks of DNA are nucleotides

• true

• false

The two strands of DNA are holding by covalent bonds.

• true

• false