DE UNIT 3 TEST REVIEW

Front

A change in a cell's DNA sequence is

Back

a mutation.

Front

Human zygotes contain a total of ______ chromosomes.

Back

46.

Front

The building blocks of nucleic acids are ______.

Back

nucleotides.

Front

An abnormal mass of tissue is a tumor.

Back

True.

Front

A gene that produces a protein used in more than one biochemical pathway is known as a(n) ___ gene.

Back

Pleiotropic.

Front

What is the process by which DNA is copied to RNA?

Back

Transcription.

Front

What is the total number of chromosomes in a human somatic cell?

Back

46.

Front

What are the three components of a nucleotide?

Back

A phosphate group, a sugar, and a nitrogenous base.

Front

What is the role of ribosomes in protein synthesis?

Back

Ribosomes are the sites where proteins are synthesized from amino acids.

Front

What is the difference between a dominant and a recessive allele?

Back

A dominant allele expresses its trait even in the presence of a recessive allele, while a recessive allele only expresses its trait when two copies are present.