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Biology II > Photosynthesis > Flashcards

Photosynthesis Flashcards

1
Q

What does photosynthesis needs?

A

carbon dioxide
water
sunlight

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2
Q

which are the photosynthesis products?

A

glucose and O2 as a biproduct

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3
Q

what are the photons?

A

smallest units of light

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4
Q

what happens in the leave with green light?

A

is reflected

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5
Q

what happens in the leave with yellow light?

A

is reflected

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6
Q

what happens in the leave with blue light?

A

is absorded

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7
Q

what happens in the leave with red light?

A

is absorbed

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8
Q

where does the photosynthesis happens?

A

in the chloroplast

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9
Q

name the 2 parts of photosynthesis

A

light dependent reactions & calvin cycle

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10
Q

synonim for calvin cycle

A

dark reactions

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11
Q

where does the light dependent reactions take place?

A

in the thylakoids

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12
Q

where does the calvin cycle takes place?

A

in the stroma

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13
Q

T or F: is the stroma inside the thylakoid?

A

no, the other way round, the thylakoid is inside the stroma

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14
Q

LD what happens in the light dependent reactions?

A

the light is converted into chemical energy

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15
Q

LD what molecules (pigments) do the photosystems have?

A

Chlorophyll

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16
Q

LD what does chlorophyl absorb?

A

photons

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17
Q

LD what do photons do inside the photosystem?

A

excite de e- to a higher state

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18
Q

LD the excited electrons go to a…

A

reaction center chlorophyll and the to a ETC, which are passed to a protein.

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19
Q

LD where are the proteins

A

in the thylakoid membrane

20
Q

LD the lost electrons in photosystem II are replaced by…

A

Photolysis

21
Q

LD what´s photolysis?

A

water molecule oxidation

22
Q

LD which are the products of Photolysis?

A

e-, H+. and 02

23
Q

LD everytime e- pass throgh proteins to photosystem I, what ion enters the thylakoid?

A

H+

24
Q

LD what ion is used as fuel for the ATP synthase?

A

H+

25
Q

LD which is the function of the ATP synthase?

A

transfroming ADP to ATP

26
Q

LD what happens to low charged electrons (proceeding from Photosystem II) when they arrive to Photosystem I?

A

they are recharged

27
Q

LD what happens to e- after they´ve reached Photosystem I?

A

they´re passed to the next protein, where they transform NADP+ into NADH

28
Q

LD which molecules are the products of the light deppendent part and what is their next step?

A

NADH and ATP, they go to the stroma

29
Q

CC where does it take place?

A

in the stroma

30
Q

CC what is its function?

A

converting chemical energy into glucose

31
Q

CC which are the three steps of the calvin cycle?

A

carbon fixation
reduction
regeneration of RuBP

32
Q

CC how does the cycle begins? (Carbon fixation)

A

1 CO2 is added to RuBP (which has 2 phosphates and 5 carbons)

33
Q

CC after we have added carbon to RuBP (first step of the cycle) what happens?

A

the six carbon, 2 phosphate molecule splits into 2 and leaves 2 molecules of 3 carbons, 1 phosphate each (PGA)

34
Q

CC formule of the Carbon Fixation

A
  • PcccccP (RuBP) + c = PccccccP

- PccccccP / 2 = 2Pccc

35
Q

CC what happens in reduction?

A

the 2 molecules of 3 carbons, 1 phosphate tranform ATP into ADP that adds one phosphate to each molecule. Then, this new molecule is in contact with NADP+, which makes it liberate 2 phosphates that makes it look again like G3P (2 molecules of 3 cabrons, 1 phosphate)

from 3 turns of this cycle we obtain 5 molecules of G3P used to reform RuBP and the extra G3P is used to make glucose

36
Q

CC formule for reduction

A

2Pccc + ATP = 2PcccP
(ADP)

2PcccP + NADH = 2Pccc
(NADP+)
(2P)

x3 turns:
5 PGA (Pccc) used to reform RuBP & 1G3P used to make glucose
37
Q

CC Regeneration of RuBP, explain

A

one molecule of 3 carbons, 1 phosphate (G3P) expells two phosphates, passes through ATP and makes again RuBP

38
Q

CC give the formule for RuBP

A

PcccccP

39
Q

CC formule for RuBP regeneration:

A

1G3P (1Pccc) expells 2P, + ATP = 3PcccccP

40
Q

CC how many molecules of G3P it takes to make 1 glucose phosphate?

A

2 molecules of G3P

41
Q

REDOX: which reactant in photosynthesis if affected by reduction and how?

A

C02, is reduced because it gains e-

42
Q

REDOX: which reactant in photosynthesis if affected by oxidation and how?

A

H20, is oxidated because it loses e-

43
Q

Which is the plant main photosynthetic organ?

A

the leaves

44
Q

where exactly are the chloroplasts?

A

in the Mesophyll

45
Q

What is the function of the ATP-ase?

A

Converting ADP into ATP

Biology II (6 decks)

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