GATE 2020 BT – Previous Year Questions with Solutions
All 65 questions of GATE 2020 BT with answers and explanations. Read each question, then practise it by topic or as a full paper.
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- Question 1 – Rajiv Gandhi Khel Ratna Award was conferred Mary Kom, a six-time world boxing champion, recently in a ceremony the Rashtrapati Bhawan in New Delhi.
- Question 2 – Despite a string of poor performances, the chances of K. L. Rahul’s selection in the team are .
- Question 3 – Complete the analogy: Cover : Uncover :: Associate : .
- Question 4 – Floods affected the summer-sown kharif crops. Officials believe this loss can be recovered through winter-sown rabi crops so the country can achieve…
- Question 5 – Find the difference between the sum of the first 2n natural numbers and the sum of the first n odd natural numbers.
- Question 6 – Repo rate is the rate at which RBI lends to commercial banks; reverse repo is the rate at which RBI borrows from them. Which statement follows?
- Question 7 – P,Q,R,S,T,U,V,W sit around a circular table. S is opposite W; U is second to the right of R; T is third to the left of R; V neighbours S. Which must…
- Question 8 – Delhi and Agra are 233 km apart. P travels from Delhi to Agra; Q starts from Agra to Delhi one hour later. They meet 75 minutes after Q starts. Both…
- Question 9 – A 44 matrix M=[m ij] has all diagonal entries zero and satisfies m ij=-m ji. What is the minimum number of elements needed to specify it?
- Question 10 – The chart shows profit percentages of companies P and Q during 2013–2018. Both invest a fixed, equal amount every year. Find the ratio of P’s total…
- Question 11 – Protein P becomes functional upon phosphorylation of a serine residue. Replacing this serine with will result in a phosphomimic mutant of P.
- Question 12 – Ras protein is a
- Question 13 – Which statements are CORRECT? [P] Viruses can play a role in causing human cancer. [Q] A tumor suppressor gene can be turned off without any change in…
- Question 14 – Which class of antibody is first made by developing B cells inside bone marrow?
- Question 15 – Determine the correctness of Assertion [a] and Reason [r] regarding mammalian cells. [a] Cells use Ca2+, and not Na+, for cell-to-cell signaling. [r]…
- Question 16 – Vincristine and vinblastine, two commercially important secondary metabolites from Catharanthus roseus, are examples of
- Question 17 – DNA synthesized from an RNA template is called
- Question 18 – Two monomeric His-tagged proteins of identical molecular weight are present in a solution. Their pI values are 5.6 and 6.8. Which technique can…
- Question 19 – During positive-negative selection, transformed animal cells expressing are killed in the presence of ganciclovir.
- Question 20 – A vector derived from which virus is used for high-frequency genomic integration of a transgene in animal cells?
- Question 21 – Which statement about Agrobacterium Ti plasmid is CORRECT?
- Question 22 – Which types of molecules act as biological catalysts? [P] Protein; [Q] RNA; [R] Phospholipid.
- Question 23 – Which medium component is used to maintain pH in mammalian cell culture?
- Question 24 – Which are energy-transducing membranes? [P] Plasma membrane of bacteria. [Q] Inner membrane of chloroplasts. [R] Inner membrane of mitochondria.
- Question 25 – Cytochrome c and ribulose 5-phosphate epimerase amino-acid sequences from 40 organisms were used to obtain a phylogenetic tree for each protein…
- Question 26 – A microorganism isolated from a salt-rich lake (salt concentration approximately 2 M) has diglycerol tetraethers with polyisoprenoid alcohol side…
- Question 27 – A function is given by f(x)=cases15,&x<1,\,&x1.cases Find the integer c for which f is continuous.
- Question 28 – Given Z=X2+Y2, find Z/ X at X = 1, Y = 0. Give an integer.
- Question 29 – Dry yeast biomass has elemental composition CH 1.6O 0.4N 0.2S 0.0024P 0.017. Find carbon contribution to dry biomass in percent, rounded to 2…
- Question 30 – Solvents A and B are completely immiscible. Solute S dissolves in both; 100 g S is added to 2 kg each of A and B. It is 1.5 times more soluble in A…
- Question 31 – A nucleotide has molecular weight 300 g/mol. Find the number of molecules in 10 picomoles, expressed as a multiple of 1012 and rounded to 2 decimals.
- Question 32 – A gas bubble of radius r in a liquid breaks into eight equal-radius bubbles. The total interfacial-area/gas-volume ratio changes from 3/r to 3n/r.…
- Question 33 – Find the largest eigenvalue of pmatrix4&1\\-2&1pmatrix.
- Question 34 – A normal random variable has mean 0 and standard deviation 3. Find the probability that a random draw is greater than 0, rounded to 2 decimals.
- Question 35 – Y is a function of t with Y(0) = 1 and Y(1) = 2. Approximate dY/dt over the interval [0,1].
- Question 36 – A block of ice at 0°C receives heat at a constant rate and is converted to superheated steam. Assume the specific heat of H₂O is independent of…
- Question 37 – The DNA below is to be amplified by PCR: 5′ GCTAAGATCTGAATTTTCC…TTGGGCAATAATGTAGCGC 3′ 3′ CGATTCTAGACTTAAAAGG…AACCCGTTATTACATCGCG 5′ Which primer pair…
- Question 38 – Which statements about immune response are CORRECT? [P] T cells are activated by antigen-presenting cells. [Q] Foreign peptides are not presented to…
- Question 39 – Which statements about the eukaryotic cell cycle are CORRECT? [P] CDKs can phosphorylate proteins in the absence of cyclins. [Q] CDKs can be…
- Question 40 – A pathway is S → W → X → Y → Z. Four complementation groups of Z-auxotrophs show the following growth on supplementation (Yes = growth): Mutant W X Y…
- Question 41 – In tomato, red fruit R is dominant over yellow r, and purple stem P over green p. The traits assort independently. A mating produces red/purple = 145,…
- Question 42 – Plant tissue culture uses [P] BAP, [Q] zeatin, [R] kinetin and [S] 2iP. Which are synthetic cytokinin analogues?
- Question 43 – Carl Woese used the gene sequence of which molecule for phylogenetic taxonomy of prokaryotes?
- Question 44 – Match Group I pathogens P influenza A virus, Q fungus, R Plasmodium, S Mycobacterium with Group II agents: 1 isoniazid; 2 amantadine; 3 fluconazole; 4…
- Question 45 – Determine the correctness of [a] Dam methylase protects E. coli DNA from phage endonucleases; and [r] E. coli Dam methylase methylates the adenosine…
- Question 46 – Determine the correctness of [a] Embryonic stem cells are suitable for developing knockout mice; and [r] Homologous recombination is more frequent in…
- Question 47 – The plasmid shown has a gap in one DNA strand, ending in 3′ OH and 5′ OH. Which enzymes are needed to fill the gap and form a covalently closed…
- Question 48 – Match organelles P mitochondrion, Q chloroplast, R nucleus, S endoplasmic reticulum with features 1 single membrane; 2 double membrane; 3 maternal…
- Question 49 – Which strategies do cells use for metabolic regulation? [P] Phosphorylation–dephosphorylation; [Q] allostery; [R] feedback inhibition.
- Question 50 – Determine the correctness of [a] A zygote and its immediate descendant cells are unspecialized and called totipotent; and [r] Totipotent cells can…
- Question 51 – Which gene-therapy statements are CORRECT? [P] Germline therapy can cure affected individuals but not their progeny. [Q] Germline therapy can cure…
- Question 52 – Determine the correctness of [a] Genetically engineered rice producing beta-carotene in its grain is called Golden rice; and [r] Provitamin A…
- Question 53 – A random 1 Mb DNA has equal proportions of all four bases. On average, how many nucleotides separate successive EcoRI recognition sites GAATTC?
- Question 54 – E. coli is grown for several generations in 15N medium, transferred to 14N medium and allowed four generations before DNA isolation. Find the…
- Question 55 – A batch reactor begins with 1 g/L biomass and a lag phase of 30 min. Log-phase specific growth rate is 0.00417\ min-1. Find total time to reach 8 g/L,…
- Question 56 – The linear system cx+y=5, 3x+3y=6 has no solution for which c?
- Question 57 – A peptide is Phe–Leu–Ile–Met–Ser–Leu. Use the supplied codon counts: Phe 2, Leu 6, Ile 3, Met 1, Ser 4. How many unique DNA sequences can encode the…
- Question 58 – A culture starts with five human fibroblast cells. Two never divide; the other three each complete three rounds of division. At that stage, what is…
- Question 59 – An organism grows on glucose in a Monod-model chemostat, with specific growth-rate parameter 0.45 h⁻¹ and Ks = 0.5 g/L. Yield Yxs = 0.4 g/g. Volume is…
- Question 60 – For f(X)=4X-X2, at which X is f maximized?
- Question 61 – Find S=1+2/3+3/9+4/27+5/81+ to infinity, rounded to 2 decimals.
- Question 62 – Proteins A and B form a covalent complex. Gel filtration shows a 200 kDa peak. SDS-PAGE with and without beta-mercaptoethanol shows single bands of 50…
- Question 63 – Cellular ATP, ADP and inorganic phosphate concentrations are 2.59, 0.73 and 2.72 mM. Find free-energy change for ATP synthesis at 37°C in kJ/mol,…
- Question 64 – An algorithm searches a database containing 78 globin sequences. It retrieves 72 sequences, of which 65 are globins. Find its sensitivity in percent,…
- Question 65 – NADH is oxidized by the mitochondrial electron-transfer chain with oxygen as terminal acceptor. Half-reactions: NAD++H++2e- NADH, E0=-0.32 V; and 12O…