What is the primary reason that plants must regulate the activity of RuBP carbox

Question

What is the primary reason that plants must regulate the activity of RuBP carboxylase?

A.) The Calvin cycle must be prevented from consuming ATP and NADPH in a wasteful futile cycle. B.)RuBP is found in high abundance, and is a very efficient enzyme. C.) Calvin cycle must be regulated to prevent the synthesis of excess GAP. D.) The Calvin cycle must be prevented from consuming CO2 in a wasteful futile cycle

Which best describers the relationship between photosynthetic reaction centers and light-harvesting complexes?

A.) Light-harvesting complexes are needed by photosynthetic reaction centers only during episodes of dim light. B.)Light-harvesting complexes absorb most of the photons, and pass the energy randomly among other such complexes until it reaches a reaction center. C.) Each photosynthetic reaction center interacts with several light-harvesting complexes that direct the energy of absorbed photons to it. D.) Each photosynthetic reaction center has one light-harvesting complex that directs the energy of absorbed photons to it

Explanation / Answer

1. Answer is A. Regulation prevents the Calvin Cycle from being active in the dark, when it might function in a futile cycle with Glycolysis and Pentose Phosphate Pathways, wasting ATP and NADPH.

2. Answer is C: Each photosynthetic reaction center interacts with several light-harvesting complexes that direct the energy of absorbed photons to it.

Light harvesting complexes, take high intense light, convert it into low intense light and finally transfer this safe light as photon energy to photosynthetic reaction centers like PS-1 & 2

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