5.2.1 Photosynthesis Flashcards

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1
Q

Structure of chlorophyll

A
  • Contains Mg 2+ group

- Not a protein

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2
Q

Structure of Chloroplast

A
  • Double membraned
  • Thylakoid discs stacked to form grana (singular granum) (site of LDS)
  • Grana are joined together by lamellae (membranous channels)
  • Complexes of pigments embedded in the thylakoids absorb light
  • Fluid enclosed is called the stroma
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3
Q

Where does the LDS occur?

A

Within and across the thylakoid membranes

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4
Q

Where does the LIS (Light Independent stage) occur?

A
  • Stroma
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5
Q

What are the reactants and products in 1 turn of the Calvin cycle?

A
  • 1 CO2
  • 1 RuBP
  • Unstable (6 - C) intermediate
  • 2 GP (3 - C)
  • 2 NADPH (ATP)
  • 2 TP (3 - C)
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6
Q

Calvin Cycle summary

A
  • Carbon Fixation - rubisco enzyme catalyses the reaction between RuBP and CO2
  • Reduction - GP is reduced by NADPH with ATP energy to TP
  • Regeneration - RuBP is regenerated with the remaining TP
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7
Q

What products from the LDS is needed for the Calvin Cycle to continue?

A
  • NADPH (reduced NADP)

- ATP

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8
Q

How are electrons transported across in the LDS?

A
  • Electron transport chain
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9
Q

What is the final electron acceptor in the LDS?

A

NADP+

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10
Q

How is ATP produced in the LDS? (Chem osmosis steps)

A
  • Energy from the movement of electrons through the transport chain is used to pump H+ ions into the Thylakoid space
  • High concentration of H+ in the thylakoid space compared to stroma forming an ELECTROCHEMICAL GRADIENT
  • H+ moves via facilitated diffusion through ATP synthase forming ATP (Chemiosmosis)
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