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In an experiment, the carbon dioxide ava...

In an experiment, the carbon dioxide available to a `C_(3)` plant was labelled with a radioactive isotope and the amount of radioactivity in the chloroplast was measured.As photosynthesis proceeded, in which of the following molecules did the radioactivity first appear ?

A

PGAL

B

PEP

C

PGA

D

RuBP

Text Solution

Verified by Experts

The correct Answer is:
C
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Comprehension The first demonstration of the stereochemistry of the S_(N^2) reaction was carried out in 1934 by Prof. E.D Hughes and his colleagues at the University of London. They allowed (R) -2- iodooctane to react with radioactive iodide ion (""^(**)I-) The rate of substitution (rate constant K_5 ) was determined by measuring the rate of incorporation of radioactivity into the alkyl halide. The rate of loss of optical acitivity from the alkyl halide (rate constant K_0 ) was also determined under the same conditions: What ratio K_0//K_s is predicted for each of the following stereochemical scenarios : For equal amounts of both retention and inversion ?

Comprehension The first demonstration of the stereochemistry of the S_(N^2) reaction was carried out in 1934 by Prof. E.D Hughes and his colleagues at the University of London. They allowed (R) -2- iodooctane to react with radioactive iodide ion (""^(**)I-) The rate of substitution (rate constant K_5 ) was determined by measuring the rate of incorporation of radioactivity into the alkyl halide. The rate of loss of optical acitivity from the alkyl halide (rate constant K_0 ) was also determined under the same conditions: What ratio K_0//K_s is predicted for each of the following stereochemical scenarios : For inversion reaction :

Choose the correct option from the following Which part of the plant takes In carbon dioxide from the air for photosynthesis?

For an experiment in botany,two different plants,plant A and plant B were grown under similar laboratory conditions.Their heights were measured at the end of each week for 3 weeks.The results are shown by the following graph.(a)How high was plant A after (i) 2 Weeks (ii)3 Weeks? (b)How high was plant B after (i) 2Weeks (ii)3 weeks? (c) How much did plant A grow during the 3rd week? (d)How much did plant B grow from the end of the 2nd week to the end of the 3rd week? (e) During which week did plant A grow most? (f)During which week did plant B grow least? (g)Were the two plants of the same height during any week shown here?Specify.

TRUEMAN BIOLOGY-PHOTOSYNTHESIS IN HIGHER PLANTS-MULTIPLE CHOICE QUESTIONS
  1. Chlorophyll shows an outburst of flourescence during the first few mo...

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  2. Photophosphorylation in chloroplast is most similar to which of the fo...

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  3. In an experiment, the carbon dioxide available to a C(3) plant was lab...

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  4. Which of the following kinds of plant fixes carbon dioxide by way of c...

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  5. The chemiosmotic theory of ATP synthesis in the chloroplast and mitoch...

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  6. A photosystem contains

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  7. Which pair is wrong

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  8. Choose the correct statement for the fixation of one CO(2) molecule

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  9. During non- cyclic photophosphorylation ATP molecules are produced thr...

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  10. Emerson effect is related to

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  11. Radioactive isotopes of oxygen (O""^(18)) was used to know the source ...

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  12. Which of the following photosynthetic characteristics are present in C...

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  13. The following compounds are intermediates in the pathway of photorespi...

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  14. C(4) plants have carboxylations

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  15. Inhibition of photosynthesis in high concentration of oxygen is mainly...

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  16. During light reaction of photosynthesis the electrons lost by pigment ...

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  17. Which of the following is essentially regenerated to complete the Calv...

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  18. During photorespiration glycolic acid is oxidised to glyoxylic acid in...

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  19. C(4) plants are more expensive in terms of ATP required for CO(2) fixa...

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  20. The plants of Cuscuta reflexa(Dodder) shows maximum photosynthesis in

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