Biological World

  1. The components of PS-I are located on the a) stroma                     b) stroma thylakoid c) granum thylakoid d) outer surface   of stromal and granal thylakoid   2. Photolysis of water during photosynthesis occurs with the help of a) PS-II                        b) PS-I c) ferredoxin                d) cytochrome   3. Of the total incident solar radiation the proportion of PAR is a) about 60%                b) less than 50% c) more than 80%         d) about 70%   3. Presence of bundle sheath is a characteristic of a) xerophytic plants   b) members of gr...

  1. The amount of which of these is    least in a cell (a) mRNA                     (b) tRNA              (c) rRNA               (d) None of these   2.Who among the following established that RNA is the genetic material? (a) Lederberg                                          (b) Griffith             (c) Nirenberg and Holley                       (d) Frankel Conrat   3. The ratio of DNA in bacterial cell and euka...