NEET 2012 Biology question
Read the following four statements (A – D) (A) Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane (B) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth (C) Stamens in flowers of Gloriosa and Petunia are polyandrous (D) Symbiotic nitrogen-fixers occur in free-living state also in soil How many of the above statements are right ?
Solution
(A) Right. In both chemiosmosis systems the electron transport chain pumps protons against their concentration gradient (into the thylakoid lumen in chloroplasts, into the intermembrane space in mitochondria) - this is uphill transport; the proton gradient is then used by ATP synthase. (B) Wrong. In dicot stems the
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