Photosynthesis Flashcards

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1
Q

Where does the Light Dependent reaction take place?

A

Grana

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2
Q

What is a redox reaction?

A

One that involves oxidation and reduction

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3
Q

What is a coenzyme?

A

A molecule which aids the function of an enzyme

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4
Q

What is NADP?

A

A coenzyme used in photosynthesis to transfer hydrogen

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5
Q

Is there an ETC in photosynthesis?

A

Yes

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6
Q

What happens when light energy is absorbed by chlorophyll in PSII?

A

Electrons are excited, and they move to a higher energy level, to the ETC and to PSI.
Light splits water and ATP is made

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7
Q

In photosynthesis the use of light in making ATP from ADP +Pi is called…?

A

Photophosphorylation

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8
Q

What do we get at the end of the Light Dependent reaction?

A

ATP
Reduced NADP
Splitting of water into hydrogen ions, electrons and oxygen

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9
Q

In Calvin’s experiment to investigate the Light independent reaction, what was the purpose of the hot methanol?

A

To kill the algae, stopping any further reactions taking place

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10
Q

Why did Calvin use the radioactive isotope of carbon in his CO2?

A

So he could see what happened to the carbon dioxide.

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11
Q

What are the main limiting factors for photosynthesis?

A

Carbon dioxide concentration
Temperature
Light intensity

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12
Q

Which molecule is made in the Calvin cycle and used to make organic substances?

A

Triose phosphate or TP

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13
Q

Which substance does ribulose biphosphate (RuBP) join with to make 2 x GP?

A

CO2

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14
Q

Which enzyme catalyses the reaction between CO2 and RuBP in the Calvin cycle?

A

Rubisco or ribulose biphosphate carboxylase

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15
Q

What is needed to make the 2 x TP from 2 x GP

A

ATP and NADPH from the Light Dependent reaction

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16
Q

5 out of every 6 molecules of TP are not used to make organic compounds. What are they used for?

A

To regenerate RuBP using ATP.

17
Q

How many times does the Calvin cycle need to turn to get a hexose (6C) sugar?

A

6 times

18
Q

What are lipids formed from?

A

Glycerol made from TP and fatty acids from GP

19
Q

Chlorophyll a, chlorophyll b and carotene absorb 2 main colours of sunlight. Which are they?

A

Red and blue

20
Q

Why do a lot of plants look green?

A

Because green light is reflected

21
Q

What is the optimum temperature for photosynthesis?

A

25 degrees Celsius

22
Q

What is the optimum carbon dioxide concentration for photosynthesis?

A

0.4%