Which of the Following Is Most Likely to Cause a Gain-Of-Function

question 49

Multiple Choice

Which of the following is most likely to cause a gain-of-function mutation?

• A) deletion of a promoter region
• B) constitutive activation of an enzyme
• C) a synonymous mutation
• D) a null mutation
• E) RNAi

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Definitions:

Synaptic Vesicles

Small organelles within neurons that store neurotransmitters, which are released into the synaptic cleft during neuronal communication.

Postsynaptic Cell

The neuron or cell that receives a signal (neurotransmitter) from another neuron at a synapse during the process of communication between neurons.

Neurotransmitters

Chemical messengers that transmit signals across a chemical synapse from one neuron (nerve cell) to another target neuron, muscle cell, or gland cell.

Myelin

A fatty white substance that surrounds the axon of some nerve cells, forming an electrically insulating layer and speeding up the transmission of nerve impulses.