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Structure and Properties of Amino Acids MCQ Questions & Answers

Structure and Properties of Amino Acids MCQs : This section focuses on the "Structure and Properties of Amino Acids". These Multiple Choice Questions (MCQs) should be practiced to improve the Structure and Properties of Amino Acids skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Which of the following is an essential amino acid?

A. Tryptophan
B. Methionine
C. Lysine
D. All of these

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Question 2

What is the product of the catabolic breakdown of Arginine?

A. Alpha-ketoglutarate
B. Fumarate
C. Oxaloacetate
D. Succinate

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Question 3

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

A. Asparagine
B. Aspartic acid
C. Glutamine
D. All of these

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Question 4

What is the end product of leucine metabolism?

A. Acetyl-CoA
B. Pyruvic acid
C. Oxaloacetic acid
D. Acetyl carnitine

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Question 5

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

A. L
B. D
C. L and D
D. None of these

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Question 6

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

A. Cysteine
B. Isoleucine
C. Valine
D. Histidine

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Question 7

Proteins and macromolecular structures take on their higher order structures

A. by self-assembly
B. with the help of molecular chaperons
C. with the help of precursor sequences that are removed from the final structures
D. all of the above

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Question 8

In a polypeptide average mass of an amino acid residue is

A. 110 daltons
B. 118 daltons
C. 80 daltons
D. 150 daltons

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Question 9

Which amino acids would most likely reside in the membrane-anchoring domain of a membrane embedded protein?

A. Isoleucine, valine and phenylalanine
B. Phenylalanine, valine, and aspartate
C. Leucine, threonine, and lysine
D. Lysine, arginine and histidine

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Question 10

The sulphur containing side chain of cysteine is

A. ampiphillic, highly reactive and capable of reacting with another cysteine
B. hydrophillc, highly reactive and capable of reacting with another cysteine
C. hydrophobic, highly reactive and capable of reacting with another cysteine
D. none of the above

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Question 11

The sequence of letters 'WYQN' will represent

A. Tryptophan, tyrosine, glutamic acid, asparagine
B. Tryptophan, tyrosine, glutamine, asparagine
C. Tryptophan, glutamine, tryptophan, asparagine
D. Glutamine, tyrosine, tryptophan, aspartic acid

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Question 12

Which of the following is not the hydrophobic and aromatic amino acid?

A. Phenylalanine
B. Tyrosine
C. Tryptophan
D. None of these

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Question 13

Which amino acid when exposed to ninhydrin produces a brown color?

A. Asparagine
B. Proline
C. Alanine
D. Valine

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Question 14

Coomassie Blue stains the proteins by reacting with

A. arginine residues
B. free c-termini
C. peptide bonds
D. aromatic ring

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Question 15

What is the product of the catabolic breakdown of Alanine?

A. Fumarate
B. Oxaloacetate
C. Pyruvate
D. Malate

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Question 16

Amino acids required in the human diet and not synthesized by the body are called

A. specialized
B. trace
C. essential
D. accessory

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Question 17

D-Alanine and L-Alanine are technically known as

A. anomers
B. enantiomers
C. epimers
D. polymer

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Question 18

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

A. Threonine & Histidine
B. Trp & Tyrosine
C. Cystein & Asparagine
D. Phenylalnine & Proline

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Question 19

How many different amino acids are there?

A. 3
B. 20
C. 100
D. An infinite number

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Question 20

Serine and threonine are polar amino acids due to

A. reactive hydroxyl group in the side chain
B. reactive alcoholic group in the side chain
C. reactive keto group in the side chain
D. reactive aldehyde group in the side chain

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Question 21

Which of the following amino acid contain an imidazolium moiety?

A. Alanine
B. Valine
C. Cysteine
D. Histidine

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Question 22

Protein fluorescence arises primarily from which residue?

A. Arginine
B. Tryptophan
C. Tyrosine
D. Phenylalanine

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Question 23

Which of the following is a nonprotein amino acid?

A. Dopamine
B. Hydroxylysine
C. Cystine
D. None of these

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Question 24

What is the heaviest of the twenty amino acids?

A. Phenylalanine
B. Tryptophan
C. Tyrosine
D. Histidine

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Question 25

Which of the following is a nonstandard amino acid?

A. Cysteine
B. Isoleucine
C. Hydroxyproline
D. Histidine

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Question 26

Which of the following is not an essential amino acid?

A. Aspartic acid
B. Glutamic acid
C. Glycine
D. All of these

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Question 27

When the amino acid alanine (R-group is CH3) is added to a solution with a pH of 7.3, alanine becomes

A. a cation
B. nonpolar
C. a zwitterions
D. an isotope

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Question 28

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

A. 1.1, and 12.1
B. 6.5, and 8.0
C. 3.3, and 10.5
D. 2.2, and 9.4

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Question 29

An essential amino acid is one that

A. is essentially easy to synthesize
B. is essential to flagella motion
C. the body cannot synthesize
D. the body can synthesize under essential conditions

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Question 30

Molecules that bear charged groups of opposite polarity are known as

A. zwitterions
B. ambions
C. ion conversion
D. amphions

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Question 31

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

A. Ala, Leu, and Val
B. Arg, His, and Lys
C. Phe, Trp, and Tyr
D. Asp, Ile, and Pro

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Question 32

Which of the following pairs of amino acids would carry a negative charge on their side chain at pH 8.0?

A. Asparagine & Glutamine
B. Leucine & Glycine
C. Histidine & Lysine
D. Aspartate & Glutamate

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Question 33

The isoelectric point of an amino acid is defined as the pH

A. where the molecule carries no electric charge
B. where the carboxyl group is uncharged
C. where the amino group is uncharged
D. of maximum electrolytic mobility

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