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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

17
Q

Phycobilin structure

A

Noncyclic, linear tetrapyrrole. Structurally similar to bilirubins.

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

Plant Sciences (2 decks)

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