Biochemistry/Biochemistry -Structure and Properties of Amino Acids Sample Test,Sample questions

Question:
 
Protein fluorescence arises primarily from which residue?

1.Arginine

2.Tryptophan

3.Tyrosine

4.Phenylalanine


Question:
 
Which of the following is an essential amino acid?

1.Tryptophan

2.Methionine

3.Lysine

4.All of these


Question:
  
The sulphur containing side chain of cysteine is

1.ampiphillic, highly reactive and capable of reacting with another cysteine

2.hydrophillc, highly reactive and capable of reacting with another cysteine

3.hydrophobic, highly reactive and capable of reacting with another cysteine

4. none of the above


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

1.specialized

2.trace

3.essential

4.accessory


Question:
An essential amino acid is one that

1. is essentially easy to synthesize

2.is essential to flagella motion

3.the body cannot synthesize

4.the body can synthesize under essential conditions


Question:
Coomassie Blue stains the proteins by reacting with

1.arginine residues

2.free c-termini

3.peptide bonds

4. aromatic ring


Question:
D-Alanine and L-Alanine are technically known as

1.anomers

2.enantiomers

3.epimers

4.polymer


Question:
How many different amino acids are there?

1.3

2.20

3.100

4. An infinite number


Question:
In a polypeptide average mass of an amino acid residue is

1.110 daltons

2.118 daltons

3.80 daltons

4.150 daltons


Question:
Molecules that bear charged groups of opposite polarity are known as

1.zwitterions

2.ambions

3.ion conversion

4.amphions


Question:
Proteins and macromolecular structures take on their higher order structures

1.by self-assembly

2.with the help of molecular chaperons

3.with the help of precursor sequences that are removed from the final structures

4. all of the above


Question:
Serine and threonine are polar amino acids due to

1.reactive hydroxyl group in the side chain

2.reactive alcoholic group in the side chain

3.reactive keto group in the side chain

4.reactive aldehyde group in the side chain


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

1.L

2.D

3.L and D

4.None of these


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

1.where the molecule carries no electric charge

2. where the carboxyl group is uncharged

3.where the amino group is uncharged

4.of maximum electrolytic mobility


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

1.1.1, and 12.1

2. 6.5, and 8.0

3.3.3, and 10.5

4. 2.2, and 9.4


Question:
The sequence of letters 'WYQN' will represent

1.Tryptophan, tyrosine, glutamic acid, asparagine

2.Tryptophan, tyrosine, glutamine, asparagine

3.Tryptophan, glutamine, tryptophan, asparagine

4. Glutamine, tyrosine, tryptophan, aspartic acid


Question:
What is the end product of leucine metabolism?

1.Acetyl-CoA

2.Pyruvic acid

3.Oxaloacetic acid

4. Acetyl carnitine


Question:
What is the heaviest of the twenty amino acids? 

1.Phenylalanine

2.Tryptophan

3.Tyrosine

4.Histidine


Question:
What is the product of the catabolic breakdown of Alanine?

1.Fumarate

2.Oxaloacetate

3.Pyruvate

4.Malate


Question:
What is the product of the catabolic breakdown of Arginine?

1.Alpha-ketoglutarate

2. Fumarate

3.Oxaloacetate

4.Succinate


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

1.an isotope

2.a cation

3.nonpolar

4.a zwitterions


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

1.Asparagine

2.Proline

3.Alanine

4.Valine


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

1.Isoleucine, valine and phenylalanine

2.Phenylalanine, valine, and aspartate

3. Leucine, threonine, and lysine

4. Lysine, arginine and histidine


Question:
Which of the following amino acid contain an imidazolium moiety?

1.Alanine

2.Valine

3.Cysteine

4.Histidine


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

1.Cysteine

2.Isoleucine

3.Valine

4.Histidine


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

1.Asparagine

2.Aspartic acid

3.Glutamine

4.All of these


Question:
Which of the following is a nonprotein amino acid?

1.Dopamine

2.Hydroxylysine

3.Cystine

4. none of the these


Question:
Which of the following is a nonstandard amino acid?

1.Cysteine

2.Isoleucine

3.Hydroxyproline

4.Histidine


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

1.Ala, Leu, and Val

2. Arg, His, and Lys

3.Phe, Trp, and Tyr

4.Asp, Ile, and Pro


Question:
Which of the following is not an essential amino acid?

1.Aspartic acid

2.Glutamic acid

3.Glycine

4. All of these


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

1.Phenylalanine

2.Tyrosine

3.Tryptophan

4. none of the these


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

1.Asparagine & Glutamine

2.Leucine & Glycine

3.Histidine & Lysine

4.Aspartate & Glutamate


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

1.Threonine & Histidine

2.Trp & Tyrosine

3.Cystein & Asparagine

4.Phenylalnine & Proline


More MCQS

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  11. Biochemistry MCQS PAPER SET 3
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