SPECTROSCOPY QUIZ

Serine and threonine are polar amino acids due to

reactive aldehyde group in the side chain

reactive alcoholic group in the side chain

reactive keto group in the side chain

reactive hydroxyl group in the side chain

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In a polypeptide average mass of an amino acid residue is

80 daltons

118 daltons

150 daltons

110 daltons

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What is the heaviest of the twenty amino acids?

Phenylalanine

Histidine

Tyrosine

Tryptophan

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What is the end product of leucine metabolism?

Acetyl carnitine

Pyruvic acid

Oxaloacetic acid

Acetyl-CoA

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The α-amino acids have a carboxyl group with a pK around , and an amino group with a pK near .

1.1, and 12.1

3.3, and 10.5

6.5, and 8.0

2.2, and 9.4

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The sequence of letters 'WYQN' will represent

Tryptophan, tyrosine, glutamine, asparagine

Tryptophan, tyrosine, glutamic acid, asparagine

Tryptophan, glutamine, tryptophan, asparagine

Glutamine, tyrosine, tryptophan, aspartic acid

TRUE ANSWER : ?
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Which of the following is not a sensible grouping of amino acids based on their polarity properties?

Arg, His, and Lys

Ala, Leu, and Val

Asp, Ile, and Pro

Phe, Trp, and Tyr

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Which of the following amino acids can form hydrogen bonds with their side (R) groups?

Aspartic acid

Asparagine

Glutamine

All of these

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Which of the following amino acid contain an imidazolium moiety?

Histidine

Alanine

Cysteine

Valine

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Which of the following amino acid is known as half-cystine residue?

Histidine

Cysteine

Valine

Isoleucine

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