BIOLOGY
PROTEINS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Amino acids, the building blocks from which proteins are formed, are relatively small molecules ____
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..which all contain an amino group, -NH2 only.
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..which all contain an amino group, -NH2, and a carbonyl group, -COOH.
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..which all contain an amino group, -NH2, and a carboxyl group, -COOH.
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..which all contain an amino group, -NH2, and a hydroxyl group, -OH.
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Explanation:
Detailed explanation-1: -Amino acids. Amino acids are the smallest and basic structural units of proteins. Amino acids of same or different types combine together to form a polypeptide chain and many polypeptide chains, in turn, join to form a complex structure called protein.
Detailed explanation-2: -An amino acid is an organic molecule that is made up of a basic amino group (−NH2), an acidic carboxyl group (−COOH), and an organic R group (or side chain) that is unique to each amino acid.
Detailed explanation-3: -The substituent −NH 2 is called an amino group. Compounds with a nitrogen atom attached to a carbonyl group, thus having the structure R−CO−NR′R″, are called amides and have different chemical properties from amines.
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