The brain messenger chemical plays an important role in memory. serotonin acetylcholine noradrenaline oxytocin

Correct B). Acetylcholine

The acetylcholine is an important neurotransmitter that is known to play an important role in the process of learning and memory. It is produced by the cholinergic neurons, which are found at various regions of the brain, which when stimulated release their stores of neurotransmitter.

But in order to show any effect, it is very important that they the right receptors. the muscarinic and nicotinic receptors are the right receptors that bind it

Hence, the correct answer would be option B.

the hardy-weinberg equation is as follows:

where is homozygous dominant, 2pq is heterozygous, and is recessive.

we also know that:

so since we know that homozygous dominant is 0.53, we can solve for p:

so then we can solve for q:

so then we can solve for the heterozygous term:

so now we know that the percentage of the population that should be heterozygous is 39.6%.