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Herb. Phys. > midterm > Flashcards

midterm Flashcards

1
Q

carbohydrates

A

energy source, structural components, and recognition

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2
Q

amino acids

A

proteins, enzymes, structural units, and regulators

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3
Q

lipids

A

major components of cell membranes, sources of energy, and hormones

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4
Q

nucleic acids

A

information storage, translation of genetic information into protein structure, energy intermediates

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5
Q

secondary components

A

defense compounds, allelochemicals, stress compounds, regulation of metabolism,

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6
Q

Mode of action

A

Sum total of the anatomical, physiological, and biochemical response that constitute the total photo toxic action.

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7
Q

Site of action

A

Precisely where in the metabolic pathway the inhibition takes place.

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8
Q

Mechanism of death

A

How the plant actually dies

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9
Q

Early herbicides

A

Copper sulfate, calcium cyanamide, sodium chlorate, sulfuric acid

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10
Q

Free radical

A

Any chemical species with one or more unpaired electrons in their orbital structure

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11
Q

Superoxide

A

Formed by adding 1 electron to the outer orbital. Can form peroxide with a hydrogen. Enzyme= superoxide dismutase

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12
Q

Hydroxyl radical

A

Free radical. Formed by peroxide catalyzed by transition metals

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13
Q

Fluorescence

A

Occurs when light is absorbed at a single wavelength and remitted at a longer wavelength

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14
Q

Inhibitors of PS II

A

Triazines, triazinones, uracils, pyridazinones, & phenyl carbamates

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15
Q

Inhibition of PS II

A

Site of action-D1

MOD- tissue destruction due to reactive oxygen

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16
Q

PS I inhibitors

A

Bipyridyliums,

17
Q

Paraquat site of action

A

Ferrodoxin

18
Q

Paraquat MOD

A

Lipid peroxidation

19
Q

Diphenylether

A

Aciflurofen

20
Q

Diphenylethers

A

MOA- inhibition of chlorophyll synthesis
SOA- protox
MOD- formation of singlet oxygen leads to lipid peroxidation

21
Q

Inhibition of carotenoid synthesis

A

SOA- Phytoene desaturase, HPPD, unknown

MOD- free radical damage due to generation of singlet oxygen

22
Q
  1. Describe in words the overall reaction of photosynthesis
A
  • Photosynthesis converts carbon dioxide to carbohydrate and oxygen by utilizing light energy from the sun and electrons from water.

Herb. Phys. (1 decks)

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