KVPY SX SB Exam 2018 Question Paper

Question : 120 of 120

Marks: +1, -0

Two independent experiments related to photosynthesis were conducted – one with 18O-labelled water(experiment P), and the other with 14C-labelled CO2 (experiment Q). Which ONE of the following optionslists the first labeled products in experiments P and Q, respectively ?

$\table P : O _2 {,},$ $Q : 3-\Phosphoglycerate$
$\table P : 3-\Phosphoglycerate{,} ,$ $Q : \NADPH$
$\table P : O_2{,} ,Q : \ATP$
$\table P : 3-\Phosphoglycerate{,} ,$ $Q : 3-\Phosphoglycerate$

Validate

Solution:

By the use of

O^18

radioisotope it was confirmed that

O_2

exist from

H_2O

not from

CO_2

during lighr reaction.
By the use of

C^14

radioisotope it was confirmed that C in

C_6H_12O_6

comes from

CO_2.

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