Photosynthesis

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What is the name of the enzyme involved in carbon fixation?

Rubulose

Carbon Fixation

When 6 carbon compound that is immediately converted into two 3 carbon compounds

Which chemical word equation summarizes the overall reactions of photosynthesis?

carbon dioxide + water = oxygen + sugar

The Calvin cycle reactions of photosynthesis cannot proceed without

the products of light reaction (ATP and NADPH)

The Calvin cycle does not operate in the dark because

- some enzymes of the cycle are inactive in the dark - the cycle depends on ATP and NADPH from light reactions - the stomates close and CO2 becomes unavailable

How many times around the Calvin cycle equal a glucose molecule?

6

How many turns of the Calvin Cycle does it take to produce one glucose molecule?

6 times

What molecules is synthesized as electrons pass between the two photo systems?

ATP

What two products from the light reactions help run the Calvin cycle?

ATP and NADPH

What does the Calvin cycle use to form glucose?

ATP and NADPH from the light reactions

What is the importance of the Calvin cycle in photosynthesis?

ATP and NADPH produced by light reaction are used in the Calvin cycle to reduce carbon dioxide to sugar

The only pigment involved in electron flow since it directly absorbs photons of light is

Chlorophyll A

What forms with NADP+ to create NADPH?

Electrons and H+ ions

The two main products of light reaction are

Glucose and Oxygen

How is ATP produced?

H+ ions diffuse across the thylakoid membrane due to movement of electrons between 2 photosystems.

Water is split during light reactions into ___________.

Hydrogen ions (H+ or protons), electrons, and oxygen gas

Why is it important to regenerate RuBP?

It is essential for carbon fixation

Carbon dioxide combines with _________ to start the Calvin cycle

RUBP

The Calvin cycle occurs in the

Stroma

Why are plants green?

They absorb all visible light, except for green

The light reactions take place in the

Thylakoids

In the light reaction of photosynthesis, light energy is absorbed by

chlorophyll and given off as high energy electrons

The most important result of photosynthesis

converting light energy into chemical energy

hydrogen ion from the thylakoid to the stroma

creates a concentration gradient

In the chloroplast, light energy causes

electrons to flow from water to NADP+

Energy from the electrons are used to pump

hydrogen ion from the thylakoid to the stroma

The light reaction of photosynthesis

include splitting a water molecule into protons, electrons and oxygen

Water energy is split due to _________.

light energy

Give one reason why the Calvin cycle cannot occur in the dark?

needs the source of light for energy

Photosynthesis produces enormous amounts of

oxygen

What is a byproduct of the Calvin cycle?

oxygen

Calvin cycle and light reactions occur

simultaneously

When does the Calvin cycle take place? (along with other reactions)

the day time

Leaves of a plant appear to be green because

the leaves absorb other wavelengths and reflect green

Chlorophyll A

the main light absorbing pigment

Photosynthesis converts

visible light into chemical energy


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