GED Science : Mutations

Study concepts, example questions & explanations for GED Science

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Example Questions

Example Question #78 : Ged Science

What type of mutation is the least dangerous to an organism?

Possible Answers:

Missense mutation

Frameshift mutation

Silent mutation

Nonsense mutation

Correct answer:

Silent mutation

Explanation:

There are a variety of mutations that can affect how a protein product is made in the body. Of the options listed, a silent mutation is the only type that does not change the final protein product. In a silent mutation, the DNA sequence is changed, but the amino acid product remains the same. Because there is no change in functionality, a silent mutation cannot harm the organism.

All of the other types of mutations listed will change what the final protein looks like, and can affect the organism in a negative way.

Example Question #79 : Ged Science

Which type of mutation creates a new stop codon for the protein being created?

Possible Answers:

Frameshift mutation

Silent mutation

Missense mutation

Nonsense mutation

Correct answer:

Nonsense mutation

Explanation:

Nonsense mutations alter the position of the stop codon in the mRNA strand, which creates a different product. The result is a shorter polypeptide chain that may not be able to function.

Silent mutations do not alter the final protein product. A missense mutation causes an amino acid to be replaced by another, different amino acid. A frameshift mutation changes how the mRNA strand is read by the ribosome, resulting in a dramatically different product.

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