CBSE Class 12 Sample Paper 2022 for Biotechnology Term 1

SAMPLE QUESTION PAPER (TERM I) 2021-22
CLASS XII
BIOTECHNOLOGY -045
Time: 90 Minutes
General Instructions:
1. The Question Paper contains three sections.
2. Section A has 24 questions. Attempt any 20 questions.
3. Section B has 24 questions. Attempt any 20 questions.
4. Section C has 12 questions. Attempt any 10 questions.
5. All questions carry equal marks.
6. There is no negative marking.
SECTION - A
Section – A consists of 24 questions. Attempt any 20 questions from this section.
The first attempted 20 questions would be evaluated.

1. It is possible to introduce colours into DNA by
A. FISH
B. Microaaray
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

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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 221 and Asp 64
C. Ser 221, His 32 and Asp 64
D. Ser 32, His 64 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. Following enzyme prevents self ligation
A. DNA ligase
B. Eco RI
C. DNA polymerase
D. Alkaline Phosphatase

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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 safer and less specific.
D. slower, less safer 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.

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20 In a PCR reaction, 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 in the reaction mixture.
C. primer is double stranded.
D. reverse transcriptase is not added.
21 In 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 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
confectionaries?
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
Section - B consists of 24 questions (Sl. No.25 to 48). Attempt any 20 questions from this
section. The first attempted 20 questions would be evaluated.

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 removal of introns is not there in the prokaryotes.
D. Enzymes necessary for post-translational modifications are also absent in
eukaryotes.

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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

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32 A sample of protein, 9x10-12 moles has to be analysed for its amino acid sequence. Which
technique/s can be used for the analysis?
A. 2 D 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

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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 COO- residue 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

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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 Assertion and Reason are true and the reason is the correct explanation of the
assertion
B. Both Assertion and Reason are true but the reason is not the correct explanation of the
assertion
C. Assertion is true but Reason are false
D. Both Assertion and Reason are false
42 Assertion: Human diet should compulsorily contain glycine, serine and tyrosine.
Reason: Essential amino acids can be synthesized in the human body.
43 Assertion: Kappa casein is involved in micelle stabilization of milk proteins and keeps the
proteins suspended uniformly in milk.
Reason: Kappa casein behaves like a lipid molecule and 2/3 rd of milk protein is
hydrophobic.
44 Assertion: At isoelectric point, the amino acid does not migrate under the influence of
electrical field.
Reason: The amino acid molecule at the isoelectric point exists as zwitter ion structure.
45 Which chromosome changes to 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.

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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. Attempt any 10 questions in this section. The first
attempted 10 questions would be evaluated.

Case 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 data set.
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

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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. SNP‟s
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
A. No simple correlation
B. Simple correlation
C. Inverse correlation
D. Depending on the organism, can be simple or Inverse
55.

In the given figure , DNA fragment is cleaved using enzyme “A” . Identify this enzyme.
A. DNA ligase
B. EcoRI
C. DNA polymerase
D. Alkaline phosphatase

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56.

Identify the short, single-stranded DNA sequence (A) which anneal to the separated strands
of DNA.
A. Primers
B. Template
C. Taq polymerase
D. dNTPs
57.

The sequence of original strand in the given autoradiogram is-
A. 5‟ ACTAGCGATG 3‟
B. 5‟ CATCGCTAGT 3‟
C. 3‟ ACTAGCGATG 5‟
D. 3‟ CATCGCTAGT 5‟

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58.

„Z‟ is an atom/group of atoms in the structure of dideoxynucleotide. Identify this.
A. Hydrogen
B. hydroxyl group
C. carboxyl group
D. phosphate group
59.

The terminals “A” and “B “ as marked in Agarose gel electrophoresis ( RFLP technique) are
A. Cathode and Anode respectively
B. Anode and Cathode respectively
C. Cathode and Neutral charge respectively.
D. Anode and Neutral charge respectively.

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60.

The label “Z” is a type of end produced in a DNA molecule. Identify it?
A. Cohesive ends
B. Sticky ends
C. Blunt ends
D. Restricted ends

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Questions in lieu of diagram based questions for VI candidates
Total Alternative Questions - 07

Section - B
36 The double stranded circular vector with antibiotic resistant genes as selectable markers is:
A. pUC 19
B. pBR 322
C. BAC
D. YAC
Section - C

55. In the formation of r DNA molecule , the enzyme which is used to cleave the Gene of
interest and vector is :
A. DNA ligase
B. EcoRI
C. DNA polymerase
D. Alkaline phosphatase
56. The short, single-stranded oligonucleotide DNA sequence which anneal to the 3‟ region of
the denatured strands of DNA.
A. Primers
B. Template
C. Taq polymerase
D. dNTPs
57. In an autoradiogram, we read the DNA sequence as 3‟ GTAGCGATCA 5‟.Trace the
sequence of original strand in the autoradiogram :
A. 5‟ ACTAGCGATG 3‟
B. 5‟ CATCGCTAGT 3‟
C. 3‟ ACTAGCGATG 5‟
D. 3‟ CATCGCTAGT 5‟
58. Di-deoxynucleotide differs from deoxynucleotide in lacking an atom/group of atoms which
is :
A. hydrogen
B. hydroxyl group
C. carboxyl group
D. phosphate group
59. The movement of RFLP in Agarose gel electrophoresis is from :
A. Cathode to Anode.
B. Anode to Cathode.
C. Cathode to Neutral charge.
D. Anode to Neutral charge.

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60. The ends which are produced after digesting the genomic DNA with EcoRI are:
A. Cohesive ends
B. Sticky ends
C. Blunt ends
D. Restricted ends

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