Topic 5A: Photosynthesis Reactions Flashcards

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1
Q

Where does the light dependent reaction takes place?

A

In the thylakoids membrane

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2
Q

In the light dependent reaction what are the three things light energy is used for?

A

– Making ATP from 80p and inorganic phosphate

– Making reduced NADP from NADP

– photolysis

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3
Q

What is the difference between cyclic photophosphorylation and non cyclic photophosphorylation?

A
  • In cyclic Photosynth. only ps1 used and electrons are passed onto NADP

– Only produce a small amounts of ATP

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4
Q

How many electrons are excited to higher energy levels in PS2 chlorophyll?

A

2

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5
Q

What is another a name for the Light independent reaction?

A

Calvin Cycle / Carbon fixation

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6
Q

Where does the Calvin cycle take place?

A

In the Stroma

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7
Q

What is Carbon fixation?

A

When Carbon from CO2 is fixed into an organic molecule

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8
Q

In the Calvin Cycle, how many molecules of ATP are used and where?(3)

A
  • 3
  • 2 when turning GP into GALP
  • 1 when turning GALP into RuBP
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9
Q

Suggest how GALP could be used to synthesise cellulose(5)

A
  1. GALP is a 3C molecule / eq
  2. reference to formation of {glucose / hexose/ 6C sugar} (from GALP)
  3. idea of enzymes involved in the synthesis of {glucose / cellulose}
  4. idea that cellulose consists of {ß-glucose / beta glucose }
  5. joined by glycosidic bonds / eq
  6. reference to 1-4 (bonds)
  7. reference to condensation reactions (between glucoses)
  8. idea that cellulose is a long chain molecule e.g. polysaccharide, polymer
  9. {unbranched / eq} molecule
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10
Q

Explain the effect of temperature on the rate of photosynthesis in a plant (4)

A
  • increasing temperature increases {movement of both enzyme and substrate molecules / kinetic energy of molecules} (1)
  • therefore molecules collide {more often / with more force} causing the rate to increase (1)
  • resulting in {enzyme denaturation / change in bonding in the enzyme} above 30 °C (1)
  • which causes active site shape to change and causing the rate to decrease (1)
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