Unit test on Unit IV and V

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Name of Subject: Biochemistry
Marks distribution
MCQs: 20 M
True or false :05M
Objective type : 05M

Name of Student *

PRN no. *

Roll no. *

1. The region of DNA where RNA polymerase binds during transcription is called as…. *

1 point

Promoter

Operator

Transcription unit

Terminator.

2. Identify the nucleotide base which is absent in RNA *

1 point

Thymine

Uracil

Adenine

Cytosine

3. B form of DNA contains_____base pairs per turn *

1 point

4. Replication of DNA occurs in which direction? *

1 point

3’ – 5’

5’ - 3’

3’ - 3’

Both A and B

5. The arm of tRNA caped with ______ *

1 point

CCA

CAA

AAC

CAC

6. The strand of the DNA which is transcribed is called…. *

1 point

Template strand

Non-coding strand

Antisense

All of them

7. Identify the stop codon in transcription process *

1 point

UAA

UAG

UGA

All of the above

8. The non protein part of enzyme is called as_____ *

1 point

Apoenzyme

Holoenzyme

Coenzyme

all of the above

9. The coenzyme NAD is derived from_______. *

1 point

Riboflavin

Folic acid

Biotin

Niacin

10. The multiple forms of an enzyme catalysing the same reaction are termed as____ *

1 point

Isoenzyme

Holoenzyme

Coenzyme

all of the above

11. Pseudogout is deposition of ………….crystals in joints *

1 point

Uric acid

Sodium urate

Calcium oxalate

Calcium pyrophosphate

12. Which amino acid does not participates in purine synthesis. *

1 point

Glutamate

Glycine

Aspartate

Alanine

13. Carbamoyl phosphate synthetase II is inhibited by *

1 point

PRPP

UTP

ATP

All of the above

14. The last reaction in purine synthesis is catalysed by *

1 point

Dehydrogenase

Hydrolase

Cyclohydrolase

Carboxylase

15. What is true about prosthetic group of enzyme. *

1 point

It can be separated by dialysis

It is covalently bound to apoenzyme

It is a protein moiety

It is bound to holoenzyme

16. Pepsin can function in pH range *

1 point

6-8

10-12

1-2

4-6

17. Most frequently found aminoacid at active site is *

1 point

Cysteine

Alanine

Glutamate

Serine

18. In competitive inhibition, *

1 point

Km value decreases whereas Vmax remains unchanged.

Km value increases whereas Vmax remains unchanged.

Vmax decreases whereas Km remains unchanged.

Vmax increases whereas Km remains unchanged.

19. Final product in purine degradation is *

1 point

Urea

Xanthine

Uric acid

Ammonia

20. IMP acts as parent nucleotide for *

1 point

AMP

TMP

UMP

UTP

21.Pyrimidine synthesis occurs on pre-existing ribose 5 phosphate *

1 point

True

False

22. The specificity of the enzyme is mostly dependent on the apoenzyme and not on the coenzyme *

1 point

True

False

23. Alloxanthine is a more effective inhibitor of xanthine oxidase than allopurinol. *

1 point

True

False

24. Genes in the DNA of eukaryotes contain introns that code for proteins *

1 point

True

False

25. In K class of allosteric enzymes,the effector changes the Km and not the Vmax *

1 point

True

False

26. Define DNA replication *

1 point

27. Define Km. *

1 point

28. Give an example of competitive inhibition *

1 point

29. Define Transcription *

1 point

30. What causes gout. *

1 point

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