Photosynthesis Flashcards

1
Q

Structure of Chloroplast

A

Structure:
- Double membrane
- Thylakoids inside chloroplast -> Contains chlorophyll in thylakoid lumen
- Stroma -> Dense fluid surrounding thylakoid discs

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2
Q

Equation of photosynthesis

A

Energy (From light) + Water (For light depedent) + CO2 (For Calvin Cycle) -> Oxygen (Light dependent product) + Sugar (Calvin Cycle Product)

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3
Q

What is the role of light in photosynthesis?

A
  1. Photosystems
    - Light energy trapped by chlorophyll pigment molecules
    - Energy is then passed into reaction center complex
    - Excites electron to higher energy state -> electron transferred to primary electron accepter
  2. Photolysis of water
    - Light is involved in photolysis of water
    - Electrons produced replenishes the electron in reaction center of photosystem II
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4
Q

Features of light dependent stage

A

Location: Across thylakoid membrane from stroma to thylakoid space
Reactants: H2O, NADP+, ADP
Products: O2+4H+4e-, NADPH, ATP
Photosystem II -> Photosystem I -> Enters Calvin Cycle

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5
Q

Describe the electron transport chain in light dependent state

A
  1. Hydrolysis of water replenishes electrons in Photosystem 2
  2. Electron enters the electron transport chain -> transported by membrane proteins
  3. Drives H+ protons from stroma into the thylakoid space -> Creates a proton gradient -> Protons diffuse from thylakoid space to stroma through ATP synthase
  4. Electrons are used to reduce NADP+ to NADPH at end of chain -> used in kelvin cycle
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6
Q

Features of light independent stage

A

Location: Stroma
Reactants: 3CO2, 6ATP, 6NADPH
Products: G3P, 6ADP, 6NADP+
- Regenerates ADP and NADP+ for light dependent stage
- Facilitated by enzymes

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