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Plant Sciences > Photosynthesis > Flashcards

Photosynthesis Flashcards

1
Q

Two processes in the photosynthesis

A

Light dependent and carbon fixation cycle

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2
Q

Two types of photosynthetic organisms

A

Oxygenic that produces oxygen and anoxygenic that don’t produce oxygen

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3
Q

Products of light reaction

A

ATP and NADPH

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4
Q

Anoxygenic organism uses what other pathway than carbon fixation

A

Reductive tricarboxylic acid cycle and hydroxypropionate pathway

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5
Q

Three photosynthetic pigments

A

Chlorophyll, carotenoids, and phycobilin

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6
Q

Are chlorophyll lipid soluble?

A

Yes

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7
Q

Types of chlorophyll molecules?

A

Chla, b, c, and d

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8
Q

Chlorophyll made of?

A

Chlorin and porphyrin

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9
Q

Chlorin has?

A

Three pyrolle rings and one pyrolline ring. One cyclopentanone ring and an isoprene tail

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10
Q

Porphyrin has

A

Four pyrrole rings.

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11
Q

In chlorophyll magnesium is bound to how many nitrogen and by which bond?

A

Two nitrogen by covalent bonds

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12
Q

Carotenoids

A

Long chain hydrocarbon having different isoprene residue in every molecule

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13
Q

Carotenoids are subdivided into?

A

Carotene and xanthophyll

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14
Q

Which one has oxygen, carotene or xanthophyll

A

Xanthophyll

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15
Q

Role of carotenoids

A

Acts as a scavenger and quencher. Protects from oxidative damage. By taking electrons from excited chlorophyll molecules and dissipating into heat.

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16
Q

What is photo inhibition

A

When an excited molecule reacts with oxygen it forms a singlet oxygen that is a reactive oxygen species

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17
Q

Phycobilin structure

A

Noncyclic, linear tetrapyrrole. Structurally similar to bilirubins.

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18
Q

Three types of phycobilin are?

A

Phycoerythrobilin, phycocyanobilin and allophycocyanobilin

19
Q

What protein does phycobilin produce

A

Phycobiliproteins

20
Q

Name the phycobiliproteins

A

Phycoerythin and phycocyanins.

21
Q

Who has phycobilin?

A

Brown algae and cyanobacteria

22
Q

Green photosynthetic bacteria has what photosynthetic pigment?

A

Chlorosome and plasma membrane

23
Q

Purple photosynthetic bacteria has what photosynthetic pigment?

A

Chromatophore of plasma membrane

24
Q

Absorption spectra

A

Degree of absorption by a molecule at different wavelengths

25
Q

Action spectra

A

Different wavelengths affecting photochemical reaction

26
Q

Photosynthetic unit? Discovered by?

A

A group of chlorophyll molecules that helps in producing one oxygen molecule. Discovered by Emerson and Arnold

27
Q

What did hill reaction tell

A

That O2 is obtained from oxidation of H2O not CO2

28
Q

What is the Hill Reagent? Why did he use it?

A

Hill reagent is Dichlorophenolindolphenol (DCPIP). He used it as an electron acceptor.

29
Q

Quantum yield

A

It is the number of oxygen made from one photon

30
Q

Quantum requirement

A

It is the number of photons used to make one oxygen.

31
Q

Two components of photosystem

A

Photochemical reaction centre and antenna molecules

32
Q

Two types of centre in photochemical reaction centre

A

Fe-S centre and pheophytin-quinone centre.

33
Q

Which bacteria does not have an antenna complex

A

Helicobacter

34
Q

Electron path in PS2

A

From P680* electron moves to pheophytin to plastoquinone to plastoquinol to cytb6f to plastocyanin and then to P700

35
Q

In PS2, the core antenna and peripheral antenna contains what?

A

Core antenna - CD47 and CD43
Peripheral antenna - LHC2

36
Q

In PS1 the peripheral and core antenna has which protein?

A

LHC1

37
Q

What is the main ion in the oxygen evolving complex

A

Mn2+

38
Q

Electron transfer in PS1

A

From P700* to modified chlorophyll molecules to phylloquinone to Fe-S complex to FD to FNR and then converts to NADPH

39
Q

One molecule of CO2 forms how many G3P?

A

2 G3P

40
Q

How many electrons are needed to form one NADPH

A

2e

41
Q

How is ATP formed during this e transfer

A

The energy that is released while transporting the electrons is used to transport protons in the lumen. Then these protons are transported out of the lumen which forms ATP.
3 photons = 1 ATP

42
Q

What forms during cyclic e flow? Is it beneficial?

A

Cyclic electron flow forms only ATP. It is preferred over non cyclic

43
Q

Function of protein kinase?

A

Disassociates the LHC2 from from PS2 to PS1 for the e transfer to PS1

44
Q

How many photons and protons used in cyclic e flow

A

4 photons and 8 protons

Plant Sciences (5 decks)

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