It Has Been Recently Determined That the Gene for Duchenne

question 41

Multiple Choice

It has been recently determined that the gene for Duchenne muscular dystrophy (DMD) is more than 2000 kb (kilobases) in length; however, the mRNA produced by this gene is only about 14 kb long. What is a likely cause of this discrepancy?

• A) The DNA represents a double -stranded structure, whereas the RNA is single -stranded.
• B) The introns have been spliced out during mRNA processing.
• C) More amino acids are coded for by the DNA than by the mRNA.
• D) The exons have been spliced out during mRNA processing.
• E) When the mRNA is produced, it is highly folded and therefore less long.

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Definitions:

Classically Conditioned Association

The learned connection between a previously neutral stimulus and an unconditioned stimulus, leading to a conditioned response.

Working Memory

A mental processing unit with finite abilities, intended for the brief storage of information for further processing.

Neurotransmitter

Chemical messengers that transmit signals across synapses from one neuron to another within the nervous system.

Kandel and Schwartz

Eric Kandel and James Schwartz, neuroscientists known for their research on the physiological basis of memory storage in neurons.