A Nonsense Mutation

question 128

Multiple Choice

A nonsense mutation:

• A)changes the identity of one amino acid in a polypeptide chain.
• B)shifts the reading frame of a messenger RNA.
• C)is usually due to a nucleotide substitution in the third position of a codon.
• D)changes a codon for an amino acid into a codon for chain termination.

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Definitions:

Slowly Adapting Receptors

Sensory receptors in the body that respond to a stimulus over an extended period, gradually decreasing in activity.

Meissner's Corpuscles

Specialized nerve endings in the skin that are sensitive to light touch, enabling the perception of texture, shape, and fine details.

Merkel's Receptors

Specialized nerve endings in the skin that respond to light touch and pressure, helping in the perception of texture and shape.

Pacinian Corpuscles

Nerve endings in the skin responsible for sensitivity to vibration and pressure, aiding in the detection of textures and fine touch.