Category: GATE Biotechnology 2018 Previous Year Papers with Solutions

Category: GATE Biotechnology 2018 Previous Year Papers with Solutions

GATE Biotechnology 2018 Previous Year Papers with Solutions

Q.65 A rod shaped bacterium has a length of 2 µm, diameter of 1 µm and density the same as that of water. If proteins constitute 15% of the cell mass and the average protein has a mass of 50 kDa, the number of proteins in the cell is _________ (1 Da = 1.6 x 10-24g)

Number of Proteins in a Rod-Shaped Bacterium Cell

Q.64 The product of complete digestion of the plasmid shown below with EcoRI and HaeIII was purified and used as a template in a reaction containing Klenow fragment of DNA polymerase, dNTPs and [α-32P]-dATP in a suitable reaction buffer. The product thus obtained was purified and subjected to gel electrophoresis followed by autoradiography. EcoRI 5′–GAATTC–3′ 3′–CTTAAG–5′ HaeIII 5′–GGCC–3′ 3′–CCGG–5′ The number of bands that will appear on the X-ray film is ________

EcoRI + HaeIII Digestion and Klenow Labeling

Q.63 Consider a simple uni-substrate enzyme that follows Michaelis-Menten kinetics. When the enzyme catalyzed reaction was carried out in the presence of 10 nM concentration of an inhibitor, there was no change in the maximal velocity. However, the slope of the Lineweaver-Burk plot increased 3-fold. The dissociation constant for the enzyme-inhibitor complex (in nM) is _________

Unveiling Enzyme Inhibition

Q.62 First order deactivation rate constants for soluble and immobilized amyloglucosidase enzyme are 0.03 min-1 and 0.005 min-1, respectively. The ratio of half-life of the immobilized enzyme to that of the soluble enzyme is (rounded off to the nearest integer) _________

Enzyme Half-Life Ratio

Q.61 Consider the following alignment of two DNA sequences:                                                               AGTAAC                                                               AA----AC Assuming an affine gap scoring scheme of an identity matrix for substitution, a gap initiation penalty of 1 and a gap extension penalty of 0.1, the score of the alignment is (up to one decimal place) _________

Calculate DNA Alignment Score

Q.60 At the end of a batch culture, glucose solution is added at a flow rate of 200 ml/h. If the culture volume after 2 h of glucose addition is 1000 ml, the initial culture volume (in ml) is _________

Calculate Initial Culture Volume

Q.59 Yeast converts glucose to ethanol and carbon dioxide by glycolysis as per the following reaction: C6H12O6 → 2C2H5OH + 2CO2 Assuming complete conversion, the amount of ethanol produced (in g) from 200 g of glucose is (up to two decimal places) ________

Ethanol from Glucose

Q.58 Mammalian cells in active growth phase were seeded at a density of 1×105 cells/ml. After 72 hours, 1×106 cells/ml were obtained. The population doubling time of the cells in hours is (up to two decimal places) ________

Mammalian Cell Population Doubling Time

Q.57 In a chemostat, the feed flow rate and culture volume are 100 mL/h and 1.0 L, respectively. With glucose as substrate, the values of μmax and Ks are 0.2 h-1 and 1 g/L, respectively. For a glucose concentration of 10 g/L in the feed, the effluent substrate concentration (in g/L) is ________

Chemostat Effluent Substrate Concentration

Q.56 A microbial strain is cultured in a 100 L stirred fermenter for secondary metabolite production. If the specific rate of oxygen uptake is 0.4 h-1 and the oxygen solubility in the broth is 8 mg/L, then the volumetric mass transfer coefficient (KLa) (in s-1) of oxygen required to achieve a maximum cell concentration of 12 g/L is (up to two decimal places) ________

Fermentation KLa Calculation

Q.55 An aqueous solution containing 6.8 mg/L of an antibiotic is extracted with amyl acetate. If the partition coefficient of the antibiotic is 170 and the ratio of water to solvent is 85, then the extraction factor is ________

Antibiotic Extraction Factor Calculation

Q.54 Moist heat sterilization of spores at 121 °C follows first order kinetics as per the expression: dN/dt = -kdN where, N is the number of viable spores, t is the time, kd is the rate constant and dN/dt is the rate of change of viable spores. If kd value is 1.0 min-1, the time (in minutes) required to reduce the number of viable spores from an initial value of 1010 to a final value of 1 is (up to two decimal places) ________

Moist Heat Sterilization

Q.53 If 1 + r + r2 + r3 + ... ∞ = 1.5, then, 1 + 2r + 3r2 + 4r3 + ... ∞ = (up to two decimal places) ________

Solving Infinite GP Sums

Q.52 The probability distribution for a discrete random variable X is given below. X 1 2 3 4 P(X) 0.3 0.4 0.2 0.1 The expectation value of X is (up to one decimal place) ________

Q.51 Calculate the following integral (up to two decimal places) ∫01 (x + 3)(x + 1) dx = ________

Calculate ∫01 (x + 3)(x + 1) dx to Two Decimal Places

Q.50 5′ capping of mRNA transcripts in eukaryotes involves the following events: P. Addition of GMP on the 5′ end Q. Removal of γ-phosphate of the triphosphate on first base at the 5′ end R. 5′-5′ linkage between GMP and the first base at 5′ end S. Addition of methyl group to N7 position of guanine Which one of the following is the correct sequence of events? (A) P, Q, R, S (B) P, R, Q, S (C) Q, P, R, S (D) Q, P, S, R

Eukaryotic mRNA 5′ Capping Sequence

Q.49 Match the industrial products mentioned in Group I with their producer organisms in Group II Group I                                      Group II P. Citric acid                    1. Trichoderma viride Q. Cellulase                     2. Clostridium acetobutylicum R. Vitamin B12               3. Aspergillus niger S. Butanol                       4. Propionibacterium freudenreichii (A) P-4, Q-3, R-1, S-2 (B) P-3, Q-1, R-2, S-4 (C) P-2, Q-1, R-4, S-3 (D) P-3, Q-1, R-4, S-2

Industrial Microbiology Matching

Q.48 A pedigree of an inheritable disease is shown below. What type of inheritance does the disease follow? (A) Autosomal dominant (B) X-linked dominant (C) X-linked recessive (D) Autosomal recessive

Pedigree Analysis

Q.47 An analysis of DNA-protein interactions was carried out using all DNA-protein complexes in the protein data bank (PDB). The frequency distribution of four amino acid residues, represented as P, Q, R and S, occurring in non-covalent interactions between the protein and DNA backbone is shown below. Which one of the following is correct? (A) P-Lys, Q-Arg, R-Gln, S-Glu (B) P-Gln, Q-Glu, R-Lys, S-Arg (C) P-Asn, Q-Asp, R-Arg, S-Lys (D) P-His, Q-Glu, R-Gln, S-Lys

Amino Acids in DNA–Protein Interactions

Q.46 Shear stress versus shear rate behavior of four different types of fluids (I, II, III and IV) are shown in the figure below. Which one of the following options is correct? (A) I-Newtonian, II-Bingham plastic, III-Dilatant, IV-Pseudoplastic (B) I-Pseudoplastic, II-Dilatant, III-Newtonian, IV-Bingham plastic (C) I-Newtonian, II-Pseudoplastic, III-Bingham plastic, IV-Dilatant (D) I-Newtonian, II-Bingham plastic, III-Pseudoplastic, IV-Dilatant

Shear Stress vs Shear Rate Graph

Q.45 Which of the following are true with regard to anaerobic respiration in bacteria? P. The final electron acceptor is an inorganic substance other than molecular oxygen Q. The number of ATP molecules produced per glucose molecule is more than that produced in aerobic respiration R. The number of ATP molecules produced per glucose molecule is less than that produced in aerobic respiration S. Only substrate level phosphorylation is used to generate ATP (A) P and S only (B) Q and S only (C) P and R only (D) P, Q and S only

Anaerobic Respiration in Bacteria

Q.44 Which of the following are true about bacterial superoxide dismutase? P. Present in obligate aerobes Q. Present in facultative anaerobes R. Present in aerotolerant anaerobes S. Absent in obligate aerobes (A) P and Q only (B) P, Q and R only (C) P and R only (D) Q and S only

Bacterial Superoxide Dismutase

Q.43 Which one of the following statements is true with regard to processing and presentation of protein antigens? (A) In the class II MHC pathway, protein antigens in the cytosol are processed by proteasomes (B) In the class I MHC pathway, extracellular protein antigens are endocytosed into vesicles and processed (C) In the class I MHC pathway, transporter associated antigen processing (TAP) protein is required for translocating processed peptides generated in the cytosol (D) Invariant chain in endoplasmic reticulum is involved in transport of peptides and loading of class I MHC

MHC Antigen Processing

Q.42 Which one of the combinations of the following statements is true about antibody structure? P. Limited proteolysis of rabbit IgG with the enzyme pepsin generates two antigen-binding regions (Fab) and an Fc fragment Q. Limited proteolysis of rabbit IgG with the enzyme papain generates a single bivalent antigen-binding region F(ab)2 and peptide fragments R. The Fc fragment of IgG can self-associate and crystallize into a lattice S. The F(ab)2 fragment of IgG is composed of both light and heavy chains (A) P and Q only (B) P and R only (C) R and S only (D) Q and S only

Unlocking Antibody Structure

Q.41 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r] Assertion: The association constant in water for the G-C base pair is three times lower than that for the A-T base pair. Reason: There are three hydrogen bonds in the G-C base pair and two in the A-T base pair. (A) Both [a] and [r] are true and [r] is the correct reason for [a] (B) [a] is false but [r] is true (C) Both [a] and [r] are false (D) Both [a] and [r] are true and [r] is not the correct reason for [a]

G-C vs A-T Base Pair Stability

Q.40 Which one of the following amino acids is catalyzed by activated macrophages to produce reactive nitrogen species? (A) Arginine (B) Asparagine (C) Cysteine (D) Histidine

Which Amino Acid Do Activated Macrophages Use ?

Q.39 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r] Assertion: Ab initio gene finding algorithms that predict protein coding genes in eukaryotic genomes are not completely accurate. Reason: Eukaryotic splice sites are difficult to predict. (A) Both [a] and [r] are false (B) [a] is true but [r] is false (C) Both [a] and [r] are true and [r] is the correct reason for [a] (D) Both [a] and [r] are true but [r] is not the correct reason for [a]

Ab Initio Gene Prediction Accuracy in Eukaryotes

Q.38 Match the classes of RNA molecules in Group I with their functions in Group II.   Group I                                         Group II P. snoRNA                   1. Protects germline from transposable elements Q. piRNA                     2. Blocks translation of selected mRNA R. miRNA                    3. Template for telomere elongation S. snRNA                     4. Modification and processing of rRNA 5. Splicing of RNA transcripts (A) P-3, Q-5, R-2, S-4 (B) P-1, Q-3, R-2, S-5 (C) P-1, Q-4, R-5, S-2 (D) P-4, Q-1, R-2, S-5

RNA Classes Matching

Q.37 Which of the following cytokines are endogenous pyrogens? P. Tumor necrosis factor- Q. Interleukin-1 R. Transforming growth factor-β S. Interleukin-10 (A) P and Q only (B) P and R only (C) R and S only (D) Q and S only

Which Cytokines Act as Endogenous Pyrogens?

Q.36 In leguminous plants, both the rhizobium genes and the plant genes influence nodulation and nitrogen fixation. Which one of the following functions is NOT encoded by the host plant genes? (A) Production of inducers that modify rhizobial cell wall (B) Production of flavonoid inducers (C) Establishment of contact between bacteria and legume (D) Root hair curling

Legume-Rhizobium Symbiosis

Q.35 Genomic DNA isolated from a bacterium was digested with a restriction enzyme that recognizes a 6-base pair (bp) sequence. Assuming random distribution of bases, the average length (in bp) of the fragments generated is ________

Average DNA Fragment Length

Q.34 A single stem cell undergoes 10 asymmetric cell divisions. The number of stem cells at the end is ________

Single Stem Cell 10 Asymmetric Divisions

Q.33 The absorbance of a solution of tryptophan measured at 280 nm in a cuvette of 2.0 cm path length is 0.56 at pH 7. The molar extinction coefficient (ε) for tryptophan at 280 nm is 5600 M-1cm-1 at pH 7. The concentration of tryptophan (in µM) in the solution is ________

Tryptophan Concentration Calculation

Q.32 The variable z has a standard normal distribution. If P(0 ≤ z ≤ 1) = 0.34, then P(z2 > 1) is equal to (up to two decimal places) ________

Finding P(z² > 1) for a Standard Normal Distribution

Q.31 The determinant of the matrix ( 4 -6 -3 2 ) is ________

How to Find the Determinant of a 2×2 Matrix

Q.30 Which one of the following plant secondary metabolites is a natural insecticide? (A) Digitoxin (B) Pyrethrin (C) Salicylic acid (D) Avenacin A-1

Plant Secondary Metabolites: Which is the Natural Insecticide?

Q.29 Which one of the following is the solution for cos²x + 2cosx + 1 = 0, for values of x in the range of 0° < x < 360°? (A) 45° (B) 90° (C) 180° (D) 270°

Solve cos²x + 2cosx + 1 = 0 for 0° < x < 360°

Q.28 Identify the character based method(s) used for the construction of a phylogenetic tree. P. Maximum parsimony Q. Neighbor joining R. Maximum likelihood S. Bootstrapping (A) Q only (B) P and R only (C) Q and S only (D) S o

Character-Based Methods for Phylogenetic Tree Construction

Q.27 Which one of the following techniques is used to monitor RNA transcripts, both temporally and spatially? (A) Northern blotting (B) In situ hybridization (C) Southern blotting (D) Western blotting

Monitor RNA Transcripts Temporally and Spatially

Q.26 Standard error is (A) the probability of a type I error in a statistical test (B) the error in estimating a sample standard deviation (C) the standard deviation of a variable that follows standard normal distribution (D) the standard deviation of distribution of sample means

Standard Error in Statistics

Q.25 Which one of the following statements is true for actin? (A) Actin filament is structurally polarized and the two ends are not identical (B) De novo actin polymerization is a single-step process (C) The pointed end of the actin filaments is the fast growing end (D) Actin forms spindle fibers during mitosis

Actin Filament Polarity

Q.24 Cell type A secretes molecule X into the culture medium. Cell type B in the same culture responds to the molecule X by expressing protein Y. Which one of the following modes of signaling represents the interaction between A and B? (A) Autocrine (B) Juxtacrine (C) Paracrine (D) Intracrine

Paracrine Signaling Explained

Q.23 Which one of the following bioreactor configurations is the basis for a trickling biological filter? (A) Stirred tank (B) Packed bed (C) Air lift (D) Fluidized bed

Packed Bed Explained

Q.22 Which of the following technique(s) can be used to study conformational changes in myoglobin? P. Mass spectrometry Q. Fluorescence spectroscopy R. Circular dichroism spectroscopy S. Light microscopy (A) P only (B) P and S only (C) Q and R only (D) S only

Techniques to Study Conformational Changes in Myoglobin

Q.21 Which one of the following is NOT a principal component of innate immunity? (A) Mucosal epithelia (B) Dendritic cells (C) Complement system (D) Memory B-cells

 Which Is NOT a Principal Component of Innate Immunity?

Q.20 Which one of the following metabolic processes in mammalian cells does NOT occur in the mitochondria? (A) Citric acid cycle (B) Oxidative phosphorylation (C) Fatty acid β-oxidation (D) Glycolysis

Which Metabolic Process Does NOT Occur in Mitochondria

Q.19 Which one of the following is INCORRECT about protein structures? (A) A protein fold is stabilized by favorable non-covalent interactions (B) All parts of a fold can be classified as helices, strands or turns (C) Two non-covalent atoms cannot be closer than the sum of their van der Waals radii (D) The peptide bond is nearly planar

Which Statement is INCORRECT About Protein Structures?

Q.18 A mixture contains three similarly sized peptides P, Q and R. The peptide P is positively charged, Q is weakly negative and R is strongly negative. If this mixture is passed through an ion-exchange chromatography column containing an anionic resin, their order of elution will be (A) P, Q, R (B) R, Q, P (C) Q, R, P (D) P, Q and R elute together

Ion-Exchange Chromatography

Q.17 Which one of the following BLAST search programs is used to identify homologs of a genomic DNA query in a protein sequence database? (A) blastp (B) blastn (C) blastx (D) tblastn

BLAST Search Programs

Q.16 Which of the following components constitute a molecular mechanics force field? P. Bond stretching Q. Bond angle bending R. Torsional bond rotation S. Non-bonded interactions (A) P and Q only (B) P, Q and R only (C) P, Q and S only (D) P, Q, R and S

Molecular Mechanics Force Field Components Explained

Q.15 Which one of the following is an example of a neurotoxin? (A) Cholera toxin (B) Streptolysin-O (C) Botulinum toxin (D) Diphtheria toxin

Which One of the Following is an Example of a Neurotoxin?

Q.14 If a segment of a sense strand of DNA is 5'-ATGGACCAGA-3', then the resulting RNA sequence after transcription is (A) 5'-AGACCAGGTA-3' (C) 5'-UACCUGGUCU-3' (B) 5'-UCUGGUCCAU-3' (D) 5'-AUGGACCAGA-3'

 Sense Strand DNA to RNA Transcription

Q.13 The repeat sequence of telomere in humans is (A) 5'-TATAAT-3' (B) 5'-TTAGGG-3' (C) 5'-GGGCCC-3' (D) 5'-AAAAAA-3'

 Human Telomere Repeat Sequence

Q.12 If serum is removed from the growth medium of human embryonic kidney cell line (HEK), then the cells will (A) proliferate faster (B) proliferate normally (C) undergo cell cycle arrest (D) undergo immediate apoptosis

Cell Cycle Arrest

Q.11 Consider an unfair coin. The probability of getting heads is 0.6. If you toss this coin twice, what is the probability that the first or the second toss is heads? (A) 0.56 (B) 0.64 (C) 0.84 (D) 0.96

Unfair Coin Probability

Q.10 In a detailed study of annual crow births in India, it was found that there was relatively no growth during the period 2002 to 2004 and a sudden spike from 2004 to 2005. In another unrelated study, it was found that the revenue from cracker sales in India which remained fairly flat from 2002 to 2004, saw a sudden spike in 2005 before declining again in 2006. The solid line in the graph below refers to annual sale of crackers and the dashed line refers to the annual crow births in India. Choose the most appropriate inference from the above data. (A) There is a strong correlation between crow birth and cracker sales. (B) Cracker usage increases crow birth rate. (C) If cracker sale declines, crow birth will decline. (D) Increased birth rate of crows will cause an increase in the sale of crackers.

Strong Correlation Between Crow Births and Cracker Sales

Q.9 If 𝑥2 + 𝑥 − 1 = 0 what is the value of 𝑥4 + 1/𝑥4 ? (A) 1          (B) 5         (C) 7         (D) 9

Solve x² + x – 1 = 0 to Find x⁴ + 1/x⁴ Value

Q.8 To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of 6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000 candidates. Question B was answered correctly by 2,50,000 candidates. Question C was answered correctly by 2,60,000 candidates. Both questions A and B were answered correctly by 1,00,000 candidates. Both questions B and C were answered correctly by 90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates. If the number of students answering all questions correctly is the same as the number answering none, how many candidates failed to clear the test? (A) 30,000 (B) 2,70,000 (C) 3,90,000 (D) 4,20,000

Candidates Failed Test

Q.7 A set of 4 parallel lines intersect with another set of 5 parallel lines. How many parallelograms are formed? (A) 20  (B) 48   (C) 60   (D) 72

Number of Parallelograms Formed by Two Sets

Q.6 An automobile travels from city A to city B and returns to city A by the same route. The speed of the vehicle during the onward and return journeys were constant at 60 km/h and 90 km/h, respectively. What is the average speed in km/h for the entire journey? (A) 72 (B) 73 (C) 74 (D) 75

Average Speed Round Trip 60 km/h to 90 km/h

Q.5 Arrange the following three-dimensional objects in the descending order of their volumes: (i) A cuboid with dimensions 10 cm, 8 cm and 6 cm (ii) A cube of side 8 cm (iii) A cylinder with base radius 7 cm and height 7 cm (iv) A sphere of radius 7 cm (A) (i), (ii), (iii), (iv) (B) (ii), (i), (iv), (iii) (C) (iii), (ii), (i), (iv) (D) (iv), (iii), (ii), (i)

Arrange 3D Objects in Descending Order of Volume

Q.4 The area of an equilateral triangle is √3. What is the perimeter of the triangle? (A) 2 (B) 4 (C) 6 (D) 8

Area of Equilateral Triangle √3

Q.3 For 0 ≤ 𝑥 ≤ 2𝜋, sin 𝑥 and cos 𝑥 are both decreasing functions in the interval ________. (A) (0, π/2) (B) (π/2, π) (C) (π, 3π/2) (D) (3π/2, 2π)

Where Sin x and Cos x Both Decrease

Q.2 “In spite of being warned repeatedly, he failed to correct his _________ behaviour.” The word that best fills the blank in the above sentence is (A) rational (B) reasonable (C) errant (D) good

In Spite of Being Warned Repeatedly

Q.1 “When she fell down the _______, she received many _______ but little help.” The words that best fill the blanks in the above sentence are (A) stairs, stares (B) stairs, stairs (C) stares, stairs (D) stares, stares

Mastering “Stairs Stares” Sentence Completion

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