Chapter 8.3: Pigments Flashcards

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1
Q

What is the relationship of absorbance vs. wavelength for a pigment molecule. This indicates which wavelengths are absorbed maximally by a pigment.?

A

absorption spectrum

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2
Q

What is a type of accessory pigment found in cyanobacteria and some algae. Complexes of these are able to absorb light energy in the green range?

A

phycobiliproteins

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3
Q

Define chlorophyll b

A

acts as an accessory pigment, or secondary light-absorbing pigment, complements and adds to the light absorption of chlorophyll a

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4
Q

What is a particle of light having discrete amount of energy?

A

photon

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5
Q

Define photoelectric effect

A

the ability of a beam of light to excite electrons, creating an electrical current

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6
Q

Define absorption spectrum

A

the relationship of absorbance vs. wavelength for a pigment molecule. This indicates which wavelengths are absorbed maximally by a pigment.

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7
Q

What is the ability of a beam of light to excite electrons, creating an electrical current?

A

photoelectric effect

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8
Q

What is a secondary light-absorbing pigment used in photosynthesis, including chlorophyll b and the carotenoids, that complement the absorption spectrum of chlorophyll a ?

A

accessory pigment

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9
Q

Define chlorophyll a

A

the main photosynthetic pigment in plants and cyanobacteria and is the only pigment that can act directly to convert light energy to chemical energy

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10
Q

Define carotenoid

A

any of a group of accessory pigments found in plants; in addition to absorbing light energy, these pigments act as antioxidants, scavenging potentially damaging free radicals

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11
Q

What is a measure of the efficiency of different wavelengths of light for photosynthesis. In plants, it corresponds to the absorption spectrum of chlorophylls?

A

action spectrum

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12
Q

Define accessory pigment

A

a secondary light-absorbing pigment used in photosynthesis, including chlorophyll b and the carotenoids, that complement the absorption spectrum of chlorophyll a

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13
Q

What is a molecule that absorbs light?

A

pigment

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14
Q

Define phycobiliproteins

A

a type of accessory pigment found in cyanobacteria and some algae. Complexes of phycobiliprotein are able to absorb light energy in the green range

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15
Q

What is any of a group of accessory pigments found in plants; in addition to absorbing light energy, these pigments act as antioxidants, scavenging potentially damaging free radicals?

A

carotenoid

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16
Q

What acts as an accessory pigment, or secondary light-absorbing pigment, complements and adds to the light absorption of chlorophyll a ?

A

chlorophyll b

17
Q

Define photon

A

a particle of light having discrete amount of energy

18
Q

What is the main photosynthetic pigment in plants and cyanobacteria and is the only pigment that can act directly to convert light energy to chemical energy?

A

chlorophyll a

19
Q

Define pigment

A

a molecule that absorbs light

20
Q

Define action spectrum

A

a measure of the efficiency of different wavelengths of light for photosynthesis. In plants, it corresponds to the absorption spectrum of chlorophylls