The Genetic Code : Lesson Check

The sides of a DNA molecule are made up of sugar molecules alternating with ____________ molecules.

• thymine

• phosphate

• cytosine

Chromosomes are made up mostly of

• DNA

• Chromatids

• RNA

In DNA, adenine always pairs with

• cytosine

• guanine

• thymine

Each __________ on a chromosome contains the information to code for one specific protein.

• spiral

• base

• gene

Each group of three DNA bases on a gene codes for a single ____________

• phosphate

• amino acid

• nitrogen

Each gene is located at a specific place on a protein.

• True

• False

DNA synthesis is the process by which DNA copies itself.

• True

• False

The process of DNA copying itself begins when the two sides of the DNA molecule unwind and separate.

• True

• False

The genetic code is determined by the sizes of the nitrogen bases.

• True

• False

Nitrogen bases are molecules that contain nitrogen and other elements.

• True

• False