BIO213: Chemistry Of Amino Acids And Proteins TMA2

Question 1 : Which of these statements is incorrect?
Aldehyde, ammonia and carbon monoxide are products of Ninhydrin reaction
Amino acids are insoluble in non-polar solvents
Amino acids behave like ions in solution.
Amino acids react with alcohols to form esters

Question 2 : Amino acids that occur in conjugated forms as components of proteins are called
Common amino acids
Natural amino acid
Uncommon amino acids
Conjugate amino acids

Question 3 : Which of these reactions is peculiar to the indole-ring of tryptophan?
Sakaguchi reaction
Reaction with formaldehyde
mMillon’s reaction
Ninhydrin test

Question 4 : How many functional groups are in a typical amino acid?
2
1
4
3

Question 5 : When cysteine reacts with iodoacetate, one of the products formed is _______________.
Hydrogen iodide
Hydrochloric acid
Ammonia
Iodine

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?
4.9
1.8
4.8
13

Question 7 : Amino acid polymers with molecular weight greater than 10,000 are called _____________.
Peptides
Sugars
Proteins
Nucleic acids

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

Question 9 : The structures of the common amino acids are similar except with respect to their
Carboxyl group
Hydrogen atom
Side chain
Amino group

Question 10 : All but one of these amino acids is optically active.
Isoleucine
Aspartic acid
Glycine
Serine

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

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

Question 13 : Two cysteine molecules form ________________.
Cysteine
Cystine
Cysteines
Cystine acid

Question 14 : Which class of protein are known as first-class proteins?
Complete
Regulatory
Fibrous
Catalytic

Question 15 : Which of these uncommon amino acids is a constituent of penicillin antibiotics?
Serotonin
Penicillamine
Penicillax
Histamin

Question 16 : Which of the following is useful in spectrophotometric measurement of amino acids?
Acylation reaction
Millon’s reaction
Xanthoproteic reaction
Ninhydrin reaction

Question 17 : One of these is a transport protein.
Somatotropin
Serum albumin
Fibrinogen
Elastin

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

Question 19 : What is the symbol of Aspartate?
A
E
D
S

Question 20 : What is the catalyst involved in the xanthoproteic reaction of aromatic ring of phenylalanine?
Manganese IV Oxide
Nitric acid
Sulphur IV Oxide
Sulphuric acid