Life Science Chapter 3 Review

The shape of a DNA molecule was first described by Watson and Crick to be a __________.

• double helix

• spiral shell

• loop-de-loop

• trapeze swing

The shape of a DNA molecule can be described as a __________.

• loop-de-loop

• trapeze swing

• sea star

• twisted ladder

The smaller subunits that make up a DNA molecule and that consist of a sugar, a phosphate, and a base are known as __________.

• amino acids

• nucleotides

• deoxyribose

• proteins

Which of the following is not a part of a nucleotide?

• a base

• a phosphate

• a gene

• a sugar

In a DNA molecule, adenine always pairs with __________.

• cytosine

• thymine

• guanine

• uracil

What base forms a base pair with guanine in DNA?

• adenine

• thymine

• cytosine

• uracil

A gene is a section of a DNA molecule that codes for a unique__________.

• base pair

• phosphate

• nucleotide

• protein

Which of the following determine(s) the protein that is built from a particular gene?

• the nucleotides present in the gene

• the order the nucleotides are in

• neither A nor B

Which RNA is produced during transcription?

• messenger RNA (mRNA)

• ribosomal RNA (rRNA)

• protein RNA (pRNA)

• transfer RNA (tRNA)

RNA uses __________ instead of thymine.

• adenine

• guanine

• cytosine

• uracil