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Chapter 28: Problem 86

Amino acids are joined into proteins by (a) \(3^{\prime}-5^{\prime}\) linkage; (b) a glycosidic bond; (c) \(\beta(1 \longrightarrow 4)\) linkage; (d) a condensation reaction; (e) none of these.

Short Answer

Expert verified
The correct answer is (d) - a condensation reaction.

Step by step solution

01

Analyzing Option A

The terminology \(\(3^{\prime}-5^{\prime}\)\) linkage usually refers to the phosphodiester bonds that link nucleotides together in a chain to form nucleic acids like DNA and RNA. This type of bond is not involved in the formation of proteins from amino acids.
02

Analyzing Option B

A glycosidic bond is a type of covalent bond that joins a carbohydrate molecule to another molecule. It is most commonly found in glycoproteins, glycolipids and in the formation of polysaccharides like cellulose, not in the formation of proteins from amino acids.
03

Analyzing Option C

\(\beta(1 \longrightarrow 4)\) linkage is a type of glycosidic bond that links monosaccharide units to form polysaccharides like cellulose and chitin. It has no role in protein synthesis.
04

Analyzing Option D

In a condensation reaction, two molecules come together to form a larger molecule, with the elimination of a smaller molecule (usually water). When amino acids come together to form a protein, they do so through condensation reactions. Each amino acid has an amino group \((\(-NH2)\)\) and a carboxyl group \((\(-COOH)\)\). In the condensation reaction that forms the peptide bond, the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water.
05

Analyzing Option E

Option E would be correct if none of the previous options were involved in the formation of proteins from amino acids, but we have seen that option D, a condensation reaction, is the correct answer.

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