BIOLOGY
AMINO ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If an amino acid with a positively charged R group and one with a negatively charged R group are near one another, the two amino acids will likely ____
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form an ionic bond
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form a covalent bond
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form a hydrogen bond
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be repelled by one another
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Explanation:
Detailed explanation-1: -When an amino acid contains both a plus and a minus charge in the “backbone", it is called a zwitterion and has an overall neutral charge. The zwitterion of an amino acid exists at a pH equal to the isoelectric point.
Detailed explanation-2: -Panel 1: The 3 positively charged amino acids are shown. These are: histidine (His, H), lysine (Lys, K), and arginine (Arg, R).
Detailed explanation-3: -For example, in some amino acids like aspartic acid and glutamic acid, the R group carries an extra carboxylic group. These amino acids are called acidic amino acids and are negatively charged at neutral pH because of the presence of extra carboxylic groups in R group.
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