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Flashcards in Class 5 Deck (122)
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1

photosynthesis powers the cellular processes in the plant and downstream, the main -- of organisms and ecological processes

energy source

2

ligher reactions are also called the -- reactions

thylakoid

3

carbon (fixation) reactions are also called the -- reactions

dark

4

the bulk of photosynthesis takes place in the leaf -- which has cells with many chloroplasts

mesophyll

5

chloroplasts have high concentration of light-absorbing -- pigments called chlorophylls

green

6

light reactions occur in the --

internal membranes (thylakoid)

7

carbon reactions occur in the -- of the chloroplast, the aqueous region surrounding the thylakoids

stroma

8

light reactions lead to the splitting of --

water

9

light reactions produce -- and -- (reducing equivalents and energy) to be provided to the carbon reactions

ATP and NADPH

10

light is an -- wave and many kinds of light exist = many wavelengths (or frequencies)

electromagnetic

11

light is also a particle so it contains --

energy (i.e. impact)

12

sunlight is a stream of -- of different frequencies

photons

13

plants can only use a narrow range of wavelengths for photosynthesis, the same range as the human eye,

visible spectrum, 400-700 nm

14

an -- of a substance quantifies its ability to take up light across the spectrum

absorption spectrum

15

absorption spectrum plots a substance's absorption of light against -- of light

wavelength

16

absorption of light energy by pigment molecules takes place when the photon causes an electron to move to a higher energy state; the molecule becomes --

excited

17

as a chlorophyll molecule returns to its less excited state, it releases the energy by emitting --, energy transfer, or photochemistry

heat, fluorescence,

18

fluorescence involves -- a photon of lower energy (longer wavelength)

re-emitting

19

energy transfer causes the -- of another pigment

excitation

20

photochemistry causes -- to occur

chemical reactions

21

photosynthetic pigments include chlorophylls (and -- in certain bacteria), and carotenoids and other accessory pigments

bacteriochlorophylls

22

photosynthetic pigments are rich in -- which stabilize the excited state

conjugated double bonds

23

chlorophyll a and chlorophyll b are made up of a complex ring structure called -- (similar to in hemoglobin)

haem group

24

a harm group contains a -- atom bonded to nitrogen

Mg

25

a harm group contains a long -- that holds the pigment anchored to a protein or membrane

hydrocarbon tail

26

carotenoids are linear molecules which give a -- color

orange

27

carotenoids are intimately associated with the -- and with photosynthetic proteins

thylakoid membrane

28

light absorbed by the carotenoids is transferred to chlorophyll for photosynthesis and thus carotenoids are --

accessory pigments

29

carotenoids also help protect from --

excess light damage

30

plots of the response of a system (i.e. products generated in a reaction) against light wavelength (used to study light-driven reactions)

action spectra