Light Reactions-Photosynthesis

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What is the waste product given off in the light reactions?

oxygen

What wavelength of light does PSII absorb?

680 nm

Which of the two wavelengths absorbed has more energy?

680 nm

What wavelength of light does PSI absorb?

700 nm

What are the two end products of the light reactions?

ATP and NADPH

What is meant by chemiosmosis? What does it produce?

ATP is formed from a build of of H+ ions inside a membrane; ATPs

Phosphorylation

Adding a phosphate to ADP to create ATP

What happens to the pH on the inside of the thylakoid when photosynthesis begins?

Becomes more acidic

Why is the flow of electrons from water to NADPH described as noncyclic?

Electrons do not end up in the same place that they started

What provides the energy to make ATPs in the light reactions?

Hydrogen gradient builds up, hydrogen goes through ATP synthase from inside to outside

What is the energy source for the light reactions?

Light

What color range are the two wavelengths in?

Red

Where do the electrons in PSII go?

Replace electrons in PSI

Where do they electrons from splitting water go?

Replace electrons in PSII

Where does the oxygen given off in photosynthesis come from?

Splitting water

Why is a membrane necessary to carry out the light reactions?

The membrane holds the molecules of the reaction in the right sequence

How do the electrons from P680 lose their extra energy so they can fit into P700?

They lose energy as they are passed to each carrier, eventually losing enough to fit into PSI

What is cyclic flow of electrons?

They start in the same place that they end

Why is cyclic flow necessary?

To balance the amount of NADPH and ATP

What is the function of the light reactions?

Turn light energy into ATP

What is the energy absorbed used to do?

Turn light energy into ATP and NADPH. Then, they are used in the dark reactions to make glucose.

Ferrodoxin

compound attached to the membrane which accepts electrons from PSI

Electron Carriers

compounds which pass electrons from one location to another in the thylakoid membrane

NADP Reductase

enzyme which attaches electrons and a hydrogen ion to NADP+

ATP Synthase

enzyme which makes ATP

Enzyme Z

enzyme which splits water

Where do the electrons in PSI go?

ferrodoxin

Photosystem

groups of chlorophyll and other molecules which absorb light of a certain wavelength

B6F Complex

large channel protein that moves hydrogen ions to the inside of the membrane

In what part of the chloroplast do the light reactions take place?

thylakoid membrane

photophosphorylation

using the energy of light to produce ATP


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