I. Start the exam by click the “Start” button
ENZYMES- Part 2
See all quizzes of ENZYMES- Part 2 here:
1. In non competitive enzyme activity inhibition,
inhibitor
(A) Increases Km (B) Decreases Km
(C) Does not effect Km (D) Increases Km
2. An enzyme catalyzing oxidoreduction,
using oxygen as hydrogen acceptor is
(A) Cytochrome oxidase
(B) Lactate dehydrogenase
(C) Malate dehydrogenase
(D) Succinate dehydrogenase
3. The enzyme using some other substance,
not oxygen as hydrogen acceptor is
(A) Tyrosinase
(B) Succinate dehydrogenase
(C) Uricase
(D) Cytochrome oxidase
4. An enzyme which uses hydrogen acceptor
as substrate is
(A) Xanthine oxidase
(B) Aldehyde oxidase
(C) Catalase
(D) Tryptophan oxygenase
5. Enzyme involved in joining together two
substrates is
(A) Glutamine synthetase
(B) Aldolase
(C) Gunaine deaminase
(D) Arginase
6. The pH optima of most of the enzymes is
(A) Between 2 and 4 (B) Between 5 and 9
(C) Between 8 and 12(D) Above 12
7. Coenzymes are
(A) Heat stable, dialyzable, non protein organic
molecules
(B) Soluble, colloidal, protein molecules
(C) Structural analogue of enzymes
(D) Different forms of enzymes
8. An example of hydrogen transferring
coenzyme is
(A) CoA (B) NAD+
(C) Biotin (D) TPP
9. An example of group transferring
coenzyme is
(A) NAD+ (B) NADP+
(C) FAD (D) CoA
10. Cocarboxylase is
(A) Thiamine pyrophosphate
(B) Pyridoxal phosphate
(C) Biotin
(D) CoA
11. A coenzyme containing non aromatic
hetero ring is
(A) ATP (B) NAD
(C) FMN (D) Biotin
12. A coenzyme containing aromatic hetero
ring is
(A) TPP (B) Lipoic acid
(C) Coenzyme Q (D) Biotin
13. Isoenzymes are
(A) Chemically, immunologically and electrophoretically
different forms of an enzyme
(B) Different forms of an enzyme similar in all
properties
(C) Catalysing different reactions
(D) Having the same quaternary structures like
the enzymes
14. Isoenzymes can be characterized by
(A) Proteins lacking enzymatic activity that are
necessary for the activation of enzymes
(B) Proteolytic enzymes activated by hydrolysis
(C) Enzymes with identical primary structure
(D) Similar enzymes that catalyse different
reaction
15. The isoenzymes of LDH
(A) Differ only in a single amino acid
(B) Differ in catalytic activity
(C) Exist in 5 forms depending on M and H
monomer contents
(D) Occur as monomers
16. The normal value of CPK in serum varies
between
(A) 4–60 IU/L (B) 60–250 IU/L
(C) 4–17 IU/L (D) > 350 IU/L
17. Factors affecting enzyme activity:
(A) Concentration (B) pH
(C) Temperature (D) All of these
18. The normal serum GOT activity ranges
from
(A) 3.0–15.0 IU/L (B) 4.0–17.0 IU/L
(C) 4.0–60.0 IU/L (D) 0.9–4.0 IU/L
19. The normal GPT activity ranges from
(A) 60.0–250.0 IU/L (B) 4.0–17.0 IU/L
(C) 3.0–15.0 IU/L (D) 0.1–14.0 IU/L
20. The normal serum acid phosphatase
activity ranges from
(A) 5.0–13.0 KA units/100 ml
(B) 1.0–5.0 KA units/100 ml
(C) 13.0–18.0 KA units/100 ml
(D) 0.2–0.8 KA units/100 ml
21. The normal serum alkaline phosphatase
activity ranges from
(A) 1.0–5.0 KA units/100 ml
(B) 5.0–13.0 KA units/100 ml
(C) 0.8–2.3 KA units/100 ml
(D) 13.0–21.0 KA units/100 ml
22. In early stages of myocardial ischemia the
most sensitive indicator is the
measurement of the activity of
(A) CPK (B) SGPT
(C) SGOT (D) LDH
23. Serum acid phosphatase level increases
in
(A) Metastatic carcinoma of prostate
(B) Myocardial infarction
(C) Wilson’s disease
(D) Liver diseases
24. Serum alkaline phosphatase level
increases in
(A) Hypothyroidism
(B) Carcinoma of prostate
(C) Hyperparathyroidism
(D) Myocardial ischemia
25. Serum lipase level increases in
(A) Paget’s disease (B) Gaucher’s disease
(C) Acute pancreatitis (D) Diabetes mellitus
26. Serum ferroxidase level decreases in
(A) Gaucher’s disease (B) Cirrhosis of liver
(C) Acute pancreatitis (D) Wilson’s disease
27. The isoenzymes LDH5 is elevated in
(A) Myocardial infarction
(B) Peptic ulcer
(C) Liver disease
(D) Infectious diseases
28. On the third day of onset of acute myocardial
infarction the enzyme elevated is
(A) Serum AST (B) Serum CK
(C) Serum LDH (D) Serum ALT
29. LDH1 and LDH2 are elevated in
(A) Myocardial infarction
(B) Liver disease
(C) Kidney disease
(D) Brain disease
30. The CK isoenzymes present in cardiac
muscle is
(A) BB and MB (B) MM and MB
(C) BB only (D) MB only
