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Biol Midterm 2 > Lecture 12: photosynthesis > Flashcards

Lecture 12: photosynthesis Flashcards

1
Q

Write the overall equation of photosynthesis

A

6CO2 + 6H2O –> C6H12O6 +6O2

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2
Q

Where does the O2 come from

A

H2O not CO2

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3
Q

What are the 2 stages of photosynthsis called

A
  1. light dependent
  2. calvin cycle
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4
Q

Where are the light dependent reactions occur?

A

thylakoid membrane

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5
Q

Where does the calvin cycle occur?

A

stroma

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6
Q

Why do we see green in plants?

A

All other colors are absorbed by chlorophyll and green is reflected back

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7
Q

What is a characteristic of chlorophyll?

A

Amphipathic

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8
Q

What is the first step of photosystems?

A

catch energy from light(e-)

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9
Q

Where does the chlorophyll catch light?

A

antenna chlorophyll

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10
Q

what is step 2?

A

water gives e- back to the chlorophyll for the one it lost
and O2 is produced

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11
Q

step 5?

A

goes to photosystem 1 for more energy

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12
Q

step3?

A

goes to pq (coenzyme)

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13
Q

step 4?

A

goes to cyt

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14
Q

step 6?

A

FD-NADP+ reductase

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15
Q

step 7?

A

NADP+ as final electron acceptor

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16
Q

Where does the proton(H+) movement flow?

A

Outside-> pq-> cyt->ATP synthase–ATP

17
Q

How does paraquot harmful to plants

A

blocks NADP reductase from accepting electron

18
Q

Where is the calvin cycle located

A

stroma

19
Q

How many steps does the calvin cycle have?

A

15

20
Q

What is carboxylation?

A

add CO2 to RuBP

21
Q

What is reduction for calvin cycle?

A

energy from ATP and NADH lead to G3P

22
Q

What is regeneration of RuBP

A

G3P are reorganized as combined to make RuBP

23
Q

What happens to the e- in PS II?

A

enters into the photo electron transport chain

24
Q

What happens to the e- in PS I?

A

e- reduces NADP+

25
Q

Trace the steps of NADP and ATP production by photosynthesis

A

OK

26
Q

What enzyme catalyzes carboxylation?

A

Rubisco

27
Q

What are the inputs of carboxylation?

A

co2, rubp

28
Q

What does rubisco do?

A

create an unstable intermediate after RuGP +CO2

29
Q

What happens after the unstable intermediate by rubisco is formed?

A

breaks down into 2 3-PGA stable

30
Q

At what pH is rubisco most active?

A

Around 8.8

31
Q

What conditions is rubisco most active?

A

a little. less concentration of H+

32
Q

Why does a small amount of G3P leave the chloroplast?

A

starch or glycolysis

33
Q

Why is RuBP regenerated?

A

Needed again for carboxylation

Biol Midterm 2 (9 decks)

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