Light reactions Flashcards

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1
Q

What are the light reactions?

A

First stage of photosynthesis where light is converted into Chemical energy

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2
Q

Where do the light reactions happen? What organelle is this in?

A

The thylakoid membrane in chloroplasts

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3
Q

What is NADPH? What does it do?

A

An electron carrier that carries 2 energized electrons.

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4
Q

What does the thylakoid structure look like?

A

A pancake

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5
Q

Where in the thylakoids do the light reactions happen?

A

Photosystems

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6
Q

What are photosystems? What do they do?

A

Large complexes of proteins and chlorophyll that capture energy

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7
Q

What connects photosystems I and II? How do they move between the protein complexes?

A

ETC, e- carriers

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8
Q

What happens in the first step of the light reactions?

A

The first photosystem absorbs light energy, which excites e- entering ETC. They’re replaced with e- from H2O, making O2 as a byproduct.

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9
Q

What happens once e- leave first photosystem?

A

They flow down the ETC, releasing energy that pumps H+ (protons) into the thylakoid.

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10
Q

What happens in the photosystem on the right?

A

Light energy excites e-, which are captured by the e- carrier NADPH

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11
Q

What powers ATP synthase? What does this lead to?

A

High concentration of protons in thylakoid, ATP production

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12
Q

What do the light reactions produce? Where is this used?

A

ATP, NADPH, and O2 (byproduct), power sugar production in Calvin Cycle

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