Q.36 Determine the correctness or otherwise of the following Assertion (a) and the Reasonv[r].Assertion [a]: Embryonic stem cells are suitable for developing knockout miceReason [r]: Homologous recombination is more frequent […]
![Q.36 Determine the correctness or otherwise of the following Assertion (a) and the Reasonv[r]. Assertion [a]: Embryonic stem cells are suitable for developing knockout mice Reason [r]: Homologous recombination is more frequent in embryonic stem cells than that in somatic cells (A) Both [a] and [r] are false (B) Both [a] and [r] are true, and [r] is the correct reason for [a] (C) Both [a] and [r] are true, but [r] is not the correct reason for [a] (D) [a] is true, but [r] is false](https://www.letstalkacademy.com/wp-content/uploads/2026/01/slide_36-10.png)
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CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES (62)
![Q.35 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion [a]: Dam methylase protects E. coli DNA from phage endonucleases Reason [r]: E. coli Dam methylase methylates the adenosine residue in the sequence "GATC" (A) Both [a] and [r] are true and [r) is the correct reason for [a] (B) Both [a] and [r) are true but [r] is not the correct reason for [a] (C) Both [a] and [r] are false (D) [a] is false but [r] is true](https://www.letstalkacademy.com/wp-content/uploads/2026/01/slide_35-10.png)
GATE Biotechnology 2020 Previous Year Papers with Solutions
Dam Methylase E. coli Protection
Q.35 Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].Assertion [a]: Dam methylase protects E. coli DNA from phage endonucleasesReason [r]: E. coli Dam methylase […]
![Q.No. 34 A list of pathogens (Group I) and a list of anti-microbial agents (Group II) used to treat their infections are given below. Match the pathogens with the corresponding anti-microbial agents. Group I Group II P] Influenza A virus 1. Isoniazid Q] Fungus 2. Amantadine R] Plasmodium 3. Fluconazole S] Mycobacterium 4. Artemisinin 5. Iodoquinol Options: P-4, Q-3, R-2, S-5 P-5, Q-2, R-4, S-1 P-2, Q-3, R-4, S-1 P-2, Q-3, R-1, S-5](https://www.letstalkacademy.com/wp-content/uploads/2026/01/slide_34-10.png)
GATE Biotechnology 2020 Previous Year Papers with Solutions
Match Pathogens with Anti-Microbial Agents
Q.No. 34 A list of pathogens (Group I) and a list of anti-microbial agents (Group II) used to treat their infections are given below. Match the pathogens with the corresponding […]
GATE Biotechnology 2020 Previous Year Papers with Solutions
Carl Woese 16S Ribosomal RNA
Q.33 Carl Woese used the gene sequence of which one of the following for phylogenetictaxonomy of prokaryotes?(A) A ribosomal RNA of large ribosomal subunit(B) A ribosomal RNA of small ribosomal […]
![Q.32 Some of the cytokinins used in plant tissue culture media are given below: [P] ВАР [Q Zeatin [R] Kinetin [S]2iP Which of these are synthetic analogs? (A) P and Q only (B) Q and S only (C) R and S only (D) P and R only](https://www.letstalkacademy.com/wp-content/uploads/2026/01/slide_32-10.png)
GATE Biotechnology 2020 Previous Year Papers with Solutions
Cytokinins in Plant Tissue Culture
Q.32 Some of the cytokinins used in plant tissueculture media are given below:[P] ВАР[Q Zeatin[R] Kinetin[S]2iPWhich of these are synthetic analogs?(A) P and Q only(B) Q and S only(C) R […]
GATE Biotechnology 2020 Previous Year Papers with Solutions
Tomato Genetics Testcross Genotypes
Q.31 In tomato plant, red (R) is dominant overyellow (r) for fruit color and purple (P) isdominant over green (p) for stem color. Fruit color and stem color assort independently.The […]
GATE Biotechnology 2020 Previous Year Papers with Solutions
Biochemical Pathway Mutant Mapping
Q.No. 30 W, X and Y are the intermediates in a biochemical pathway as shown below: S → W → X → Y → Z Mutants auxotrophic for Z are […]
![Q.No. 29 Which of the following statements are CORRECT about eukaryotic cell cycle? [P] CDKs can phosphorylate proteins in the absence of cyclins [Q] CDKs can be inactivated by phosphorylation [R] Degradation of cyclins is required for cell cycle progression [S] CDKs are not involved in chromosome condensation (A) P and R only (B) P and S only (C) P, Q and R only (D) Q and R only](https://www.letstalkacademy.com/wp-content/uploads/2026/01/slide_29-11.png)
GATE Biotechnology 2020 Previous Year Papers with Solutions
Eukaryotic Cell Cycle
Q.No. 29 Which of the following statements are CORRECT about eukaryotic cell cycle? [P] CDKs can phosphorylate proteins in the absence of cyclins [Q] CDKs can be inactivated by phosphorylation […]
![Q.No. 28 Which of the following statements about immune response are CORRECT? [P] T cells are activated by antigen-presenting cells [Q] Foreign peptides are not presented to helper T cells by Class II MHC proteins [R] Dendritic cells are referred to as professional antigen-presenting cells (A) P and R only (B) P and Q only (C) Q and R only (D) P, Q and R](https://www.letstalkacademy.com/wp-content/uploads/2026/01/slide_28-11.png)
GATE Biotechnology 2020 Previous Year Papers with Solutions
Immune Response MCQ
Q.No. 28 Which of the following statements about immune response are CORRECT? [P] T cells are activated by antigen-presenting cells [Q] Foreign peptides are not presented to helper T cells […]
GATE Biotechnology 2020 Previous Year Papers with Solutions
PCR Primer Design for DNA Amplification
Q.No. 27 The DNA sequence shown below is to be amplified by PCR: 5′ GCTAAGATCTGAATTTTCC…….TTGGGCAATAATGTAGCGC3′ 3′ CGATTCTAGACTTAAAAGG…….AACCGTTATTACATCGCG5′ Which one of the following pair of primers can be used for this […]
