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Chapter 28: Problem 85

The \(R\) group of valine is (a) \(-\mathrm{CH}_{2} \mathrm{OH}\) (b) \(-\mathrm{CH}_{2} \mathrm{COOH} ;(\mathrm{c})-\mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}\) (d) \(-\mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\); (e) none of these.

Short Answer

Expert verified
The 'R' group of valine is (c) \(-\mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}\)

Step by step solution

01

Understanding the question

Firstly, it's important to understand that amino acids are composed of a basic structure: an amino group, a carboxyl group, a hydrogen atom, and an 'R' group or side chain, which is different for each amino acid and determines its properties. The question is asking for the 'R' group of valine, specifically.
02

Recalling the structure of valine

The amino acid valine has an 'R' group that consists of a two-carbon aliphatic straight chain that branches off to a third carbon, which in turn is branched to two other carbon atoms, meaning its 'R' group is \(-\mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}\).
03

Identifying the correct option

From the given options, it can be identified that (c) \(-\mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}\) is the correct 'R' group for valine.

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Most popular questions from this chapter

A molecule in which the energy of metabolism is stored is (a) glucose; (b) DNA; (c) RNA; (d) glycerol; (e) ATP.

Describe what is meant by each of the following terms, using specific examples where appropriate: (a) \(\alpha\) -amino acid; (b) zwitterion; (c) isoelectric point; (d) peptide bond; (e) tertiary structure.

Describe what is meant by each of the following terms, using specific examples where appropriate: (a) polypeptide; (b) protein; (c) N-terminal amino acid; (d) \(\alpha\) helix; (e) denaturation.

The structure of the DNA molecule is best described as (a) a random coil; (b) a double helix; (c) a pleated sheet; (d) partly coiled; (e) a branched chain.

Draw condensed structural formulas showing what form you would expect for the essential amino acid threonine (a) in strongly acidic solutions; (b) at the isoelectric point; and (c) in strongly basic solutions.
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