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PROTEINS AND PROTEIN METABOLISM- Part 17
See all quizzes of PROTEINS AND PROTEIN METABOLISM- Part 17 here:
1 Which one of the following statements
concerning glutamine is correct?
(A) Contains three tetratable groups
(B) Is classified as an acidic amino acid
(C) Contains an amide group
(D) Migrates to the cathode during electrophoresis
at pH 7.0
2. One of the given example is an amino
acid:
(A) Oh-Lysine (B) Protein
(C) Leucine (D) Serine
3. The lone pair of electrons at one of the
ring nitrogens in the given amino acid
makes a potential ligand, which is
important in binding the iron atoms in
hemoglobin:
(A) Tryptophan (B) Threonine
(C) Histidine (D) Serine
4. The amino acid which is not optically
active is
(A) Alanine (B) Glycine
(C) Glutamine (D) Lysine
5. Optically active compounds are capable of
(A) Different reactions
(B) Rotating plane of polarized light
(C) Showing same chemical properties
(D) None of these
6. The reference compound for absolute configuration
of optically active compound is
(A) Alanine (B) Lactic acid
(C) Glyceraldehyde (D) Dihydroxy acetone
7. All the standard amino acids except the
following have one chiral ‘c’ atom:
(A) Threonine, Isoleucine
(B) Isoleucine, Alanine
(C) Threonine, Alanine
(D) Alanine, Glutamine
8. The role of complement proteins:
(A) Defense
(B) Helps immunity of the body
(C) Not predicatable
(D) None of these
9. Optical isomers that are mirror images
and non superimposable are called
(A) Diastereomers (B) Euantiomers
(C) dl isomers (D) Stereomers
10. Living cells have the unique ability to
synthesize only _________ the form of
optical isomer due to _________.
(A) ‘d’ form, stereospecific enzymes
(B) ‘l’ form stereospecific enzymes
(C) ‘d’ form, DNA
(D) ‘L’ form, DNA
11. Isoelectric pH of an amino acid is that pH
at which it has a
(A) Positive charge (B) Negative charge
(C) No net charge (D) All of these
12. Albuminoids are similar to
(A) Albumin (B) Globulin
(C) Both A and B (D) None of these
13. Abnormal chain of amino acids in sickle
cells anaemia is
(A) Alpha chain (B) Beta chain
(C) Gama chain (D) Delta chain
14. In prehepatic jaundice, protein flocculation
test is
(A) Normal/weekly positive
(B) Usually positive
(C) Negative
(D) None of these
15. Side chains of all amino acids contain
aromatic rings except
(A) Pheynl alanine (B) Alanine
(C) Tyrosine (D) Tryptophan
16. In Nitroprusside test, amino acid cystein
produces
(A) Blue colour complex
(B) Red colour
(C) Yellow colour
(D) Purple colour
17. Bonds that are formed between two
cysteine residues is
(A) Disulphide (B) Peptide
(C) Electrostatic (D) Hydrophobic
18. The acid amide of Aspartic acid is
(A) Glutamine (B) Arginine
(C) Aspargine (D) Ornithine
19. It is the only amino acid having an
ionizing ‘R’ group with a pK’ near 7 and
is important in the active site of some
enzymes:
(A) Arginine (B) Cystein
(C) Cystine (D) Histidine
20. Hemoglobin has a high content of this
amino acid:
(A) Proline (B) Leucine
(C) Arginine (D) Histicline
21. A hexa peptide with 5 aspartic acid would
have a net charge at pH 7:
(A) Neutral (B) Positive
(C) Negative (D) Not predictable
22. In the genetic disorder of cystinuria, the
patient excretes large quantities of
cystine in their urine and its low solubility
causes crystalline cystine to precipitate as
stones in kidneys. The remedy involves
56 MCQs IN BIOCHEMISTRY
ingesting Na HCO3. Reaction of this
treatment is
(A) NaHCO2 combines with cystine
(B) NaHCO3 raises the pH above the isoelectric
point of cystine
(C) NaHCO3 prevents stone formation by
hydrolysis of cystine to cysteine
(D) None of these
23. In the following reaction, Alanine acts as a
3 3
3 3
+ → +
H H
| |
H N – C –COO—— H N – C –COOH
| |
CH CH
(A) Acid (B) Base
(C) Zwitter ion (D) None of these
24. Amino acids excepting histidine are not
good buffering agents in cell because
(A) They exist as zwitter ions
(B) Their pk and not in the physiological pH of a
cell
(C) Only Histidine has pk of its R group at 6.0
unlike the others which have at a different pH
(D) None of these
25. At neutral pH Alanine has the following
structure:
(A) − − 2
3
H
H N C COOH
CH
(B) + 3 − −
3
H
H N C COO
CH
(C) 2 − −
3
H
H N C COO
CH
(D) + 2 − −
3
H
H N C COO
CH
26. The amino acids in which the R groups
have a net positive charge at pH 7.0 are
(A) Lysine, Arginine, Histidine
(B) Lysine, Aspargine
(C) Histidine, Aspargine
(D) Glutamine, Arginine
27. Apolipoproteins are
(A) AI (B) AI1
(C) C1 (D) All of these
28. The amino acid which has a pK near 4 and
thus is negatively charged at pH 7 is
(A) Alanine (B) Glutamic acid
(C) Glutamine (D) Aspargine
29. The side chain of which of the following
amino acid contain sulphur atom?
(A) Methionine (B) Threonine
(C) Leucine (D) Tryptophan
30. Which of the followings gives a positive
test for Ninhydrin?
(A) Reducing sugars (B) Triglycerides
(C) Alpha aminoacids (D) Esterified Fats
