Rats Placed in Isolated and Unenriching Environments Become Learning-Impaired Due

question 11

Multiple Choice

Rats placed in isolated and unenriching environments become learning-impaired due to the:

• A) increased development of dendritic spines.
• B) lack of development of proper neurotransmitters.
• C) development of large numbers of glial cells.
• D) biochemical changes resulting in a heavier cerebral cortex.
• E) poor development of synaptic contacts.

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Definitions:

Codon

A sequence of three nucleotides in messenger RNA (mRNA) that specifies the addition of a specific amino acid to a growing polypeptide chain during protein synthesis.

AUG

The codon for methionine in messenger RNA (mRNA), serving as the initiation signal for translation in protein synthesis.

UAA

A stop codon in the genetic code that signals the end of a protein-coding sequence in mRNA transcription.

Messenger RNA

A molecule that carries genetic information from DNA to the ribosome, where it directs protein synthesis.