Tag: GATE Life Science Previous Year Papers with Solutions

Q.57 Which of the following statements are TRUE on DNA delivery methods during plant transformation? P. Single stranded nicks are made in T-DNA border repeat by the VirD1, VirD2 and VirD3 […]

Q.56 Which of the following statements in photosynthesis are CORRECT? P. The absorption maxima for photosystem I (PS I) and PS II are 680 nm and 700 nm, respectively Q. Photosynthetic […]

Q.55 A photoautotrophic micropropagation system can be established by increasing the (A) sucrose concentration in the culture medium (B) CO2 concentration in the culture medium (C) agar concentration in the culture […]

Q.54 Retrograde signaling involves communication of (A) nucleus to the chloroplast (B) endoplasmic reticulum to the nucleus (C) nucleus to the mitochondria (D) chloroplast to the nucleus Retrograde signaling in plants […]

Q.53 The DNA content of a nucleus can be measured by (A) ESR Spectroscopy (B) FTIR Spectroscopy (C) Flow Cytometry (D) X-Ray Crystallography Flow cytometry is the standard technique for measuring […]

Q.52 The transition of water molecule from liquid to glassy state during cryopreservation is termed as (A) Vitrification (B) Hyperhydricity (C) Cryoprotectant (D) Habituation Vitrification prevents ice crystal damage in cryopreservation […]

Q.51 In which one of the following phases of cell cycle the drug colchicine exerts its effect? (A) G1 (B) G2 (C) S (D) M Colchicine disrupts microtubule formation, arresting cells […]

Q.50 One of the defense mechanisms adopted by plants for detoxification of heavy metals is the synthesis of (A) Phytochelatin (B) Calmodulin (C) Tubulin (D) Systemin Plants synthesize phytochelatins to […]

Q.49 During photorespiration the reactive oxygen species, H2O2, is produced in (A) Glyoxysome (B) Lysosome (C) Peroxisome (D) Dictyosome Hydrogen peroxide (H2O2) forms during photorespiration in plant cells under high […]

Q.48 The mutagen ethidium bromide acts as a (A) Deaminating agent (B) Alkylating agent (C) Intercalating agent (D) Base analogue Ethidium bromide is a classic intercalating agent used in molecular biology […]