The side chain of an amino acid labeled basic is most likely

The side chain of an amino acid labeled ‘basic’ is most likely ______ at cellular pH and it therefore ______ water. Fill in the blanks with the word pair that correctly completes the sentence.

a) negatively-charged; repels

b) positively-charged; attracts

c) positively-charged; repels

d) negatively-charged; attracts

e) positively-charged; forms ionic bonds with

Solution

Anwer : The correct answer is B

The side chain of an amino acid labeled ‘basic’ is most likely POSITIVELY CHARGED at cellular pH and it therefore ATTRACTS water. Side chain of a basic amino acid will be positively charged at physiological pH.Hence it is polar and charged