Category: GATE Biotechnology 2025 Previous Year Papers with Solutions

Category: GATE Biotechnology 2025 Previous Year Papers with Solutions

GATE Biotechnology 2025 Previous Year Papers with Solutions

Q.18 Correctly match the following Monosaccharides with their respective Epimers. Monosaccharide                          Epimer P. D-mannose                    1. C-3 epimer of D-glucose Q. D-allose                         2. C-4 epimer of D-glucose R. D-galactose                   3. C-4 epimer of D-mannose S. D-talose                          4. C-2 epimer of D-glucose                                              5. C-5 epimer of D-glucose (A) P-4; Q-1; R-2; S-3 (B) P-5; Q-1; R-2; S-3 (C) P-4; Q-3; R-5; S-1 (D) P-1; Q-5; R-3; S-2

Unlocking Monosaccharide Epimers

Q.17 Which one of the following coenzymes is utilised by alanine racemase for the conversion of L-Alanine to D-Alanine? (A) Pyridoxal phosphate (B) Thiamine pyrophosphate (C) Tetrahydrofolate (D) Flavin mononucleotide

Alanine Racemase Coenzyme

Q.16 Which one of the following is true for piRNAs? (A) piRNAs silence transposable elements in germ cells (B) piRNA is the abbreviation of P-element interacting RNA (C) piRNAs modify the 2′-OH of ribose with methyl group (D) piRNA is a long non-coding RNA

Understanding piRNAs

Q.15 The diversity in T-cell receptors is generated by (A) gene rearrangements (B) somatic hypermutation of rearranged V region (C) gene conversion (D) class switching

T-Cell Receptor Diversity

Q.14 The minimum value of the function 𝑓(𝑥) = 𝑥 +4/𝑥 for 𝑥 > 0 is (A) 1 (B) 2 (C) 3 (D) 4

Minimum Value of x + 4 / x x+4/x for x > 0

Q.13 Let 𝑦(𝑡) be a bacterial population whose growth is given by                                 dy/dt=𝜆(𝑦 + 2) where 𝜆 is the growth rate constant. If 𝑦(0) = 1 and 𝑦(1) = 4, then the value of 𝜆 is (A) ln 2 (B) ln 3 (C) ln 4 (D) ln 6

Solving Bacterial Population Growth Differential Equation

Q.12 Corynebacterium diphtheriae causes diphtheriain humans, only when thisbacterium is infected by (A) phage β (B) epsilon phage (C) T4 phage (D) lambda phage

Corynebacterium-Diphtheriae-Phage-Beta-Diphtheria-Cause

Q.11 Koch's postulate was established by Robert Koch while working on a disease caused by (A) Mycobacterium tuberculosis (B) Bacillus anthracis (C) Streptococcus pneumoniae (D) Bacillus subtilis

Koch’s Postulates

Q.10 An object is said to have an n-fold rotational symmetry if the object, rotated by an angle of 2π/n, is identical to the original. Which one of the following objects exhibits 4-fold rotational symmetry about an axis perpendicular to the plane of the screen? Note: The figures shown are representative.

4-Fold Rotational Symmetry Explained

Q.9 A circle with center at (x, y) = (0.5, 0) and radius = 0.5 intersects with another circle with center at (x, y) = (1, 1) and radius = 1 at two points. One of the points of intersection (x,y) is: (A)(0,0) (B)(0.2, 0.4) (C) (0.5,0.5) (D) (1,2)

Circle Intersection Solved

Q8. A color model is shown in the figure with color codes: Yellow (Y), Magenta (M), Cyan (Cy), Red (R), Blue (BI), Green (G), and Black (K). Which one of the following options displays the color codes that are consistent with the color model?

CMY Color Model Question Explained

Q.7 Rohit goes to a restaurant for lunch at about 1 PM. When he enters the restaurant, he notices that the hour and minute hands on the wall clock are exactly coinciding. After about an hour, when he leaves the restaurant, he notices that the clock hands are again exactly coinciding. How much time (in minutes) did Rohit spend at the restaurant? (A) 64 6⁄11 (B) 66 5⁄13 (C) 65 5⁄11 (D) 66 6⁄13  

Clock Hands Coinciding

Q.6 "Why do they pull down and do away with crooked streets, I wonder, which are my delight, and hurt no man living? Every day the wealthier nations are pulling down one or another in their capitals and their great towns: they do not know why they do it; neither do I. It ought to be enough, surely, to drive the great broad ways which commerce needs and which are the life-channels of a modern city, without destroying all history and all the humanity in between: the islands of the past." (From Hilaire Belloc's "The Crooked Streets") Based only on the information provided in the above passage, which one of the following statements is true? (A)The author of the passage takes delight in wondering. (B)The wealthier nations are pulling down the crooked streets in their capitals. (C)In the past, crooked streets were only built on islands. (D)Great broad ways are needed to protect commerce and history.

Decoding Hilaire Belloc’s Lament

Q.5 The figures I, II and III are parts of a sequence. Which one of the following options comes next in the sequence at IV?

Logical Reasoning Sequence Question

Q.4 A thin wire is used to construct all the edges of a cube of 1 m side by bending, cutting and soldering the wire. If the wire is 12 m long, what is the minimum number of cuts required to construct the wire frame to form the cube? (A) 3 (B) 4 (C) 6 (D) 12

Minimum Number of Cuts to Form a Wire Cube Frame

Q.3 The sum of the following infinite series is: 1/1! +1/2! +1/3! +1/4! +1/5! + … (A) π (B) 1 + e (C) e − 1 (D) e  

Sum of Infinite Series 1/1! + 1/2! + 1/3! + … = e – 1

Q.2 As the police officer was found guilty of embezzlement, he was ____ dismissed from the service in accordance with the Service Rules. Select the most appropriate option to complete the above sentence. (A) sumptuously (B) brazenly (C) unintentionally (D) summarily

Police Officer Embezzlement

Q.1 Is there any good show _________television tonight? Select the most appropriate option to complete the above sentence. (A) in (B) at (C) with (D) on

Best Preposition for TV Shows

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