Question and BIO213: Chemistry Of Amino Acids And Proteins TMA2

Question 1 : Which of these statements is incorrect?

A. Aldehyde, ammonia and carbon monoxide are products of Ninhydrin reaction
B. Amino acids are insoluble in non-polar solvents
C. Amino acids behave like ions in solution.
D. Amino acids react with alcohols to form esters

Answer to question 1 is D. Amino acids react with alcohols to form esters

 

Question 2 : Amino acids that occur in conjugated forms as components of proteins are called

A. Common amino acids
B.  Natural amino acid
C.  Uncommon amino acids
D. Conjugate amino acids

Answer to question 2 D. Conjugate amino acids

 

Question 3 : Which of these reactions is peculiar to the indole-ring of tryptophan?

A. Sakaguchi reaction
B. Reaction with formaldehyde
C. Millon’s reaction
D. Ninhydrin test

Answer to question 3 B. Reaction with formaldehyde

 

Question 4 : How many functional groups are in a typical amino acid?

A.  2
B.  1
C. 4
D. 3

Answer to question 4 A.  2

Question 5 : When cysteine reacts with iodoacetate, one of the products formed is _______________.

A.  Hydrogen iodide
B.  Hydrochloric acid
C. Ammonia
D. Iodine

Answer to question 5 A.  Hydrogen iodide
 

Question 6 : What is the pH of an acid buffer solution containing 0.1 M sodium ethanoate and 0.1 M ethanoic acid with Pka 4.8?

A.  4.9
B.  1.8
C.  4.8
D.  13

Answer to question 6 is C.  4.8

 

Question 7 : Amino acid polymers with molecular weight greater than 10,000 are called _____________.

A.  Peptides
B.  Sugars
C.  Proteins
D. Nucleic acids

Answer to question 7 is C.  Proteins

Question 8 : In the prsence of a strong acid amino acids react with alkanol to give one of the following

A.  Ketone
B.  Aldehyde
C.  Alcohol
D.  Ester

Answer to question 8 is B.  Aldehyde

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Question 9 : The structures of the common amino acids are similar except with respect to their

A.  Carboxyl group
B.  Hydrogen atom
C.  Side chain
D.  Amino group

Answer to question 9 is C.  Side chain

Question 10 : All but one of these amino acids is optically active.

A.  Isoleucine
B.  Aspartic acid
C.  Glycine
D.  Serine

Answer to question 10 is C.  Glycine

Question 11 : Which of these amino acids will form red complexes with Million’s reagent

A.  Serine
B.  Tyrosine
C.  Alanine
D.  Lysine

Answer to question 11 is B.  Tyrosine

Question 12 : Which of these amino acids will form give a yellow coloration with concentrated nitric acid

 
A.  Tryptophan
B.  leucine
C.  Isoleucine
D.  Glycine

Answer to question 12 is A. Tryptophan

Question 13 : Two cysteine molecules form ________________.

A.  Cysteine
B. Cystine
C.  Cysteines
D.  Cystine acid

Answer to question 13 is B. Cystine

Question 14 : Which class of protein are known as first-class proteins?

A.  Complete
B.  Regulatory
C.  Fibrous
D.  Catalytic

Answer to question 14 is A.  Complete

Question 15 : Which of these uncommon amino acids is a constituent of penicillin antibiotics?

A.  Serotonin
B.  Penicillamine
C.  Penicillax
D.  Histamin

Answer to question 15 is B.  Penicillamine

Question 16 : Which of the following is useful in spectrophotometric measurement of amino acids?

A.  Acylation reaction
B.  Millon’s reaction
C.  Xanthoproteic reaction
D.  Ninhydrin reaction

Answer to question 16 is D.  Ninhydrin reaction

Question 17 : One of these is a transport protein.

A.  Somatotropin
B.  Serum albumin
C.  Fibrinogen
D.  Elastin

Answer to question 17 is B.  Serum albumin

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Question 18 : One of these amino acids reacts with formaldehyde with sulphuric acid to give a bluish-purple colouration

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

Answer to question 18 is D.  Tryptophan

 

Question 19 : What is the symbol of Aspartate?

A.  A
B.  E
C.  D
D.  S

Answer to question 19 is C.  D

Question 20 : What is the catalyst involved in the xanthoproteic reaction of aromatic ring of phenylalanine?

A.  Manganese IV Oxide
B.  Nitric acid
C.  Sulphur IV Oxide
D.  Sulphuric acid

Answer to question 20 is D.  Sulphuric acid

 

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