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In an experiment that carbon dioxide ava...

In an experiment that 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

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The correct Answer is:
C
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Structural isomers have different covalent linkage of atoms. Stereoisomers are compounds that have same sequence of covalent bonds but differ in the relative dispositions of their atoms in space. Geometri cal and optical isomers are the two important types of configurational isomers. The compound with double bonds or ring structure have restricted rotation, so exist in two geometrical forms. The double bonds in larger rings (ring size 10 carbon large) can also cause geometrical isomerism. The optical isomers rotate the plane of plane-polarised light. A sp^(3) -hybridised carbon atom bearing four different types of substituents is called an asymmetric centre or chiral centre. A chiral object or molecule cannot be superimposed on its mirror image. Stereoisomers that are mirror images of each other are called enantiomers. The stereosomers that the pot mirror images of each other are called diastereomers. Diasteremers have different physical properties. A racemic mixture is optically inactive and contains equal amounts of both the enantiomers. Resolution refers to method of separating a racemic mixture. Into two pure enantiomers. A meso compound is an optically inactive stereoisomer, which is achiral due to the presence of an internal plane of symmetry or centre of symmetry within the molecule. The following two compounds are

AAKASH SERIES-PHOTOSYNTHESIS IN HIGHER PLANTS -Exercise - III
  1. In an experiment that carbon dioxide available to a C3 plant was label...

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  2. Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in :

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  3. With reference to factors affecting the rate of Photosynthesis, which ...

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  4. Emerson's enhancement effect and Red drop. have been instrumental is t...

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  5. Oxygenic photosynthesis occurs in

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  6. Anoxygenic photosynthesis is characteristic of

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  7. Transition state structure of the substate formed during an enzymatic ...

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  8. An aleg which can be employed as food for human beings

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  9. Read the following four statements (A-D) Both , A) Photophosphoryl...

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  10. Which one of the following organisms is correctly matched with its thr...

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  11. The process that makes important difference between C3 and C4 plants ...

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  12. Kranz anatomy is typical of .

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  13. The process that makes important difference between C3 and C4 plants ...

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  14. The correct sequence of cell organelles during Photorespiraition is

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  15. Of the total incident solar rediation the proportion of PAR is

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  16. CAM helps the plants in

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  17. In Kranz anatomy , the bundle sheath cells have

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  18. PGA as the first carbon dioxide fixation product was discovered in Pho...

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  19. C4 Plants are more efficient Photosynthesis than C3 plants due to

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  20. Study the pathway given below: In which of the following options...

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  21. Read the following four statements ,A,B,C and D select the right optio...

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