A membrane which limits the type of molecules which will pass through it is called .
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Amino acids are acids on one hand, and a base on the other hand.
<h3>What is an acid?</h3>An acid is a substance that produces hydrogen or hydroxonium ions as the only positively charged ion when it ionizes.
All amino acids have an amine group - and a carboxylic group -
.
The carboxylic group ionizes such that:
The presence of the amine group enables amino acids to also act as a base.
More on amino acids can be found here: brainly.com/question/14583479
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