PHOTOSYNTHESIS AND RESPIRATION QUIZ

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

Valine

Histidine

Isoleucine

Cysteine

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The sequence of letters 'WYQN' will represent

Tryptophan, tyrosine, glutamic acid, asparagine

Tryptophan, tyrosine, glutamine, asparagine

Tryptophan, glutamine, tryptophan, asparagine

Glutamine, tyrosine, tryptophan, aspartic acid

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Stereo chemical configuration of all a-amino acids derived from proteins is

None of these

D

L

L and D

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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

2.2, and 9.4

3.3, and 10.5

6.5, and 8.0

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Which pair of amino acids absorbs the most UV light at 280 nm?

Phenylalnine & Proline

Trp & Tyrosine

Cystein & Asparagine

Threonine & Histidine

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Coomassie Blue stains the proteins by reacting with

aromatic ring

arginine residues

free c-termini

peptide bonds

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The sulphur containing side chain of cysteine is

None of these

ampiphillic, highly reactive and capable of reacting with another cysteine

hydrophillc, highly reactive and capable of reacting with another cysteine

hydrophobic, highly reactive and capable of reacting with another cysteine

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What is the product of the catabolic breakdown of Alanine?

Oxaloacetate

Malate

Pyruvate

Fumarate

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D-Alanine and L-Alanine are technically known as

enantiomers

epimers

polymer

anomers

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What is the product of the catabolic breakdown of Arginine?

Oxaloacetate

Succinate

Fumarate

Alpha-ketoglutarate

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