Class 12

Class 12 Biotechnology Sample Question Paper 2022 Term I

Class 12 Biotechnology Sample Paper 2022 Term I

Time: 3 Hrs

Marks: 70

SECTION – A

1. It is possible to introduce colours into DNA by

A. FISH
B. Microarray
C. Nick translation
D. SNP

2. The protein that provides the body structure and protection to our bones is

A. collagen.
B. hemoglobin.
C. actin
D. myosin

3. Restriction enzymes were discovered by

A. W. Arber, H. Smith and D. Nathans
B. Paul Berg and Herbert Boyer
C. Annie Chang and Stanley Cohen
D. Kerry Mullis

4. Foreign DNA is directly introduced in to the recipient cell using a fine micro-syringe to transform it in the following technique-

A. Electroporation
B. Microinjection
C. Biolistics
D. Transfection

5. Which feature of the vectors provides flexibility in the choice of restriction enzymes?

A. MCS
B. Ori
C. Unique restriction enzyme recognition site
D. Size

6. Interferon β is used for the treatment of

A. Hepatitis C
B. Hepatitis B
C. Multiple Sclerosis
D. Chronic Granulomatous Disease

7. In situ activation of chymotrypsin takes place in the

A. jejunum.
B. duodenum.
C. ileum.
D. pancreas.

8. The enzymatic activity of subtilisin is contributed by

A. Ser 221, His 64, and Asp 32
B. Ser 32, His 22,1 and Asp 64
C. Ser 221, His 3,2, and Asp 64
D. Ser 32, His 6,4 and Asp 221

9. The most common type of restriction enzymes used in recombinant DNA technology are

A. Type I restriction enzymes
B. Type II restriction enzymes
C. Type III restriction enzymes
D. Type IV restriction enzymes

10. After n cycles, the number of DNA copies produced are-

A. n²
B. 2ⁿ
C. nx2
D. n÷2

11. Cosmids have the cos site of

A. BAC
B. YAC
C. Plasmid
D. Lambda

12. The following enzyme prevents self-ligation

A. DNA ligase
B. Eco RI
C. DNA polymerase
D. Alkaline Phosphatase

13. Essential amino acids are those which

A. have to be obtained from food
B. can be made in our cells
C. can not be obtained from food
D. need not be essentially supplemented in the diet

14. Severe combined immunodeficiency is caused due to the absence of

A. prions.
B. chymotrypsin.
C. esterases.
D. adenosine deaminase.

15. Culture-based approaches for detecting pathogens, as compared to PCR-based assays, are

A. faster, safer, but less specific.
B. slower but safer and more specific.
C. slower, less safe, and less specific.
D. slower, less safe, but more specific.

16. A 100 Kb DNA fragment has to be cloned in a host cell. Which vector should be used for this experiment?

A. Plasmid
B. Cosmid
C. BAC
D. Bacteriophage lambda

17. The tripeptide present in whey that makes it a nutraceutical protein is

A. Glutathione
B. Kappa -casein
C. Hexokinase
D. Urease

18. Different proteins move differently in SDS–PAGE. It is due to varying

A. size
B. charge
C. isoelectric point
D. pH

19. The Bioactive molecule used to treat Myocardial Infarction is a

A. proteolytic enzyme.
B. monoclonal antibody.
C. non-catalytic protein.
D. polyclonal antibody.

20. In a PCR reaction, the following components were taken: ds DNA, Taq polymerase, dNTPs, and ds primer, but even after 30 cycles, no amplification of the target DNA could be seen. The reason for this is because the

A. Template is DNA and not RNA.
B. ddNTPs are not added to the reaction mixture.
C. Primer is double-stranded.
D. Reverse transcriptase is not added.

21. In the Protein fingerprinting technique

A. Paper chromatography is followed by paper electrophoresis.
B. Paper electrophoresis is followed by paper chromatography.
C. Paper chromatography and paper electrophoresis are carried out simultaneously.
D. Neither paper chromatography nor paper electrophoresis takes place.

22. Who has received the Nobel Prize for deducing the structure of haemoglobin?

A. Linus Pauling
B. Max Perutz
C. V.M. Ingram
D. Frederick Sanger

23. Which functional property of whey proteins, where they undergo Maillard reaction, is used in confectioneries?

A. Viscosity
B. Gelation
C. Browning
D. Emulsification

24. Name the dye which is used for the visualization of Proteins in 2D gel electrophoresis?

A. Ethidium bromide
B. FDA
C. Silver stain
D. Evan’s blue

SECTION – B

25. Why are eukaryotic hosts preferred for expressing eukaryotic recombinant proteins?

A. Enzymes necessary for the proper folding of the proteins are absent in eukaryotes.
B. Enzymes necessary for the splicing mechanism are absent in eukaryotes.
C. Machinery for the removal of introns is not there in prokaryotes.
D. Enzymes necessary for post-translational modifications are also absent in eukaryotes.

26. The order of steps in an RFLP experiment is

A. Isolation of DNA, Digestion with Restriction enzyme, Agarose gel electrophoresis
B. Agarose gel electrophoresis, Isolation of DNA, Digestion with Restriction enzyme
C. Digestion with Restriction enzyme, Isolation of DNA, Agarose gel electrophoresis
D. Isolation of DNA, Agarose gel electrophoresis, Digestion with Restriction enzyme

27. Microscopic particles of gold or tungsten are coated with the DNA of interest and

bombarded onto cells with a particle gun to introduce foreign DNA into host cells. What is this method known as?

A. Biolistics
B. Microinjection
C. Electroporation
D. Transfection

28. Identification and analysis of protein networks involved in the nuclear pore complex is one of the successes of

A. structural proteomics.
B. functional proteomics.
C. expression proteomics.
D. proteome mining.

29. In a 2‟-3‟ dideoxynucleotide triphosphate-

A. 5’ phosphate group is absent
B. 3’-OH group is absent
C. 3’ phosphate group is absent
D. 5’-OH group is absent

30. A protein with a molecular weight of 10000 contains 5,4,3,2, and 1 charges. The mass spectrometer detects the protein ions respectively at mass/charge-

A. 10001; 5001; 3334; 2501 and 2001
B. 2001; 2501; 3334; 5001 and 10001
C. 4001; 5001; 6668; 10001 and 20001
D. 20001; 10001; 6668; 5001 and 4001

31. Bacteria protect themselves from infection by bacteriophages by using

A. DNA ligases
B. DNA polymerases
C. Restriction enzymes
D. Cosmids

32. A sample of protein, 9×10-12 moles, has to be analysed for its amino acid sequence. Which technique/s can be used for the analysis?

A. 2D Gel Electrophoresis
B. Protein fingerprinting
C. Mass Spectrometry
D. Both (a) and (b)

33. Identify the gene transfer technique: Mixing of DNA with charged substances like calcium phosphate, cationic liposomes, or DEAE dextran and overlaying on recipient host cells. Host cells take up the DNA.

A. Transfection
B. Transformation
C. Biolistics
D. Electroporation

34. From Blue-White selection, we infer that-

A. White colonies represent non-recombinant bacteria
B. Blue colonies represent non-recombinant bacteria
C. Blue colonies represent recombinant bacteria
D. Blue and white colonies represent non-recombinant bacteria

35. Transplant rejection can be prevented by administering a therapeutic antibody

A. t-PA
B. OKT-3
C. Humulin
D. Platelet-derived growth factor

36. Identify the vector shown below –

A. pUC 19
B. pBR 322
C. BAC
D. YAC

37. The goal of mass spectrometric analysis is to create

A. gas phase ions from polar charged molecules.
B. polar charged molecules from gas phase ions.
C. liquid ions from non-polar molecules.
D. non-polar molecules from liquid ions.

38. Which technique is used for improving laundry detergent subtilisin?

A. SDS-PAGE
B. Mass Spectrometry
C. Site-directed Mutagenesis
D. Protein fingerprinting

39. In the enzyme chymotrypsin, why does Ser 195 develop a negative charge on its -OH group?

A. Negatively charged Asp COO residue pulls the Ser–OH proton through His
B. Negatively charged Ser COO residue pulls the Asp–OH proton through His
C. Positively charged Asp COO residue pulls the Ser–OH proton through His
D. Positively charged Ser COOresidue pulls the Asp–OH proton through His

40. Chymosin and Papain are industrial enzymes used respectively in

A. cheese and beverage industries.
B. beverage and cheese industries.
C. soap and cheese industries.
D. leather processing and meat industries.

41. Which one of the following is an autosomal recessive disorder?

A. Cystic Fibrosis
B. Huntington disease
C. Alzheimer’s disease
D. Migraine

Question No. 42 to 44 consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

A. Both (A) and (R) are true, and (R) is the correct explanation of (A)
B. Both (A) and (R) are true, but (R) is not the correct explanation of (A)
C. (A) is true, but (R) is false
D. Both (A) and (R) are false

42 (A): Human diet should compulsorily contain glycine, serine and tyrosine.

(R): Essential amino acids can be synthesized in the human body.

Ans: D. Both (A) and (R) are false

43 (A): Kappa casein is involved in micelle stabilization of milk proteins and keeps the proteins suspended uniformly in milk.

(R): Kappa casein behaves like a lipid molecule, and 2/3 rd of milk protein is hydrophobic.

Ans: A. Both (A) and (R) are true, and (R) is the correct explanation of (A)

44 (A): At isoelectric point, the amino acid does not migrate under the influence of electrical field.

(R): The amino acid molecule at the isoelectric point exists as a zwitterion structure.

Ans: A. Both (A) and (R) are true, and (R) is the correct explanation of (A)

45. Which chromosome changes to the Philadelphia chromosome due to reciprocal translocation?

A. chromosome 9
B. chromosome 22
C. Either A or B
D. chromosome 24

46 Physicians decide our susceptibility or resistance to a particular disease through-

A. SNPs
B. Nick translation
C. FISH
D. SDS-PAGE

47 Whey has been administered to the sick for the treatment of numerous ailments as it results in

A. elevation of a tripeptide glutathione in cells.
B. reduction of a tripeptide glutathione in cells.
C. reduction of xenobiotic levels in our body.
D. elevation of xenobiotic levels in our body.

48 Biological Value refers to

A. The amount of protein nitrogen that is retained by the body from a given amount of protein nitrogen that has been consumed.
B. Growth expressed in terms of weight gain of an adult by consuming 1 gm of food protein.
C. The total amount of protein nitrogen that has been consumed.
D. Growth expressed in terms of weight gain of an adult by consuming 1 Kg of food protein.

SECTION – C

Section- C consists of one case followed by 6 questions linked to this case (Q.No. 49 to 54). Besides this, 6 more questions are given.

Gene prediction and counting

Gene prediction is an important problem for computational biology, and there are various algorithms that do gene prediction using known genes as a training dataset. The following table shows Genome size and gene predictions between several organisms.

Based on your observation and analysis, answer the following questions.

49 Even if we know where the genes are in a given genome, it’s difficult to count them due to

A. Splice Variants
B. overlapping genes
C. exons
D. Both A and B

50 Which organism has the maximum part of the genome coding for the proteins?

A. Escherichia coli
B. Saccharomyces cerevisiae
C. Caenorhabditis elegans
D. Drosophila melanogaster

51. Part of the genome that encodes for protein in Homo sapiens is less than 5 %, one of the probable reason/s for this could be

A. Repeated Sequence
B. Exons
C. Both “a” and “ b”
D. SNPs

52 The relationship between number of chromosomes and genome size in base pairs is

A. direct
B. indirect
C. no relationship
D. correlation of 0.5

53 Computational Gene prediction is referred to as

A. In-silico gene prediction
B. In Vivo Gene prediction
C. In vitro Gene prediction
D. Microarray prediction

54. After observing the table, it seems that the relationship between the intuitive complexity of an organism and the number of genes in its genome is