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Biol 1500 > Ch 10: Photosynthesis > Flashcards

Ch 10: Photosynthesis Flashcards

(55 cards)

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1
Q

photosynthesis

A

solar energy -> chemical energy

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2
Q

autotrophs

A
  • self feeders
  • sustain themselves w/o eating anything derived from other organisms
  • producers
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3
Q

producers

A

make organic molecules from CO2 & other inorganic molecules

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4
Q

plants are ______

A

photoautotrophs

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5
Q

photoautotrophs

A

use light energy to make organic molecules

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6
Q

organisms that do photosynthesis

A

plants, algae, certain other protists, & some prokaryotes

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7
Q

heterotrophs

A

get organic material from other organisms
- consumers
- depend on photoautotrophs

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8
Q

chloroplasts

A

organelle where photosynthesis happens

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9
Q

chlorophyll

A

green pigment in chloroplasts

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10
Q

light energy absorbed by chlorophyll drives ________ of organic molecules in chloroplast

A

synthesis

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11
Q

CO2 enters and O2 exits through

A

stomata

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12
Q

mesophyll

A

interior tissue of the leaf
- where most chloroplasts are found

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13
Q

thylakoid

A

connected sacs in chloroplast

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14
Q

thylakoid could be stacked in columns called

A

grana

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15
Q

stroma

A

dense fluid

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16
Q

photosynthesis equation

A

6CO2 + 12H2O + light => C6H12O6 + 6O2 + 6H2O

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17
Q

CO2 splits into

A

O in water, C6 & O6 in glucose

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18
Q

H2O splits

A

H12 in glucose, H2 in water, & O2

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19
Q

photosynthesis is a ____ process

A

redox

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20
Q

H2O is _____ & CO2 is _______

A

oxidized

reduced

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21
Q

two stages of photosynthesis

A

light reactions & calvin cycle

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22
Q

light reactions happen in

A

thylakoid

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23
Q

calvin cycle happens in

24
Q

light reaction

Study These Flashcards
A
  • split water
  • release O2
  • produce ATP
  • make NADPH
25
calvin cycle
- makes sugar from CO2 - uses ATP & NADPH - carbon fixation
26
thylakoids (light reaction)
transform light energy into chemical energy of ATP & NADPH
27
wavelength
distance between crests of waves
28
What does wavelength determine/
type of electromagnetic energy
29
spectrophotometer
measure's pigments ability to absorb various wavelenghts
30
absorption spectrum
graph plotting a pigment's light absorption versus wavelength
31
chlorophyll a
violet & red light is best for photosynthesis
32
action spectrum
relative effectiveness of different wavelengths of radiation in driving a process
33
chlorophyll b
broadens the spectrum
34
caroteniods
absorb excessive light that would damage chlorophyll
35
what are the two accessory pigments?
chlorophyll b & carotenoids
36
what is a photosystem
reaction center (RC) surrounded by light-harvesting complexes (LHC)
37
LHC
pigment molecule bound to proteins - funnel energy of photons to reaction center
38
primary electron acceptor
accepts an excited electron from chlorophyll a
39
two types of phyotosystems
photosystem I and photosystem II
40
photosystem II (PSII)
- functions first - 680 nm
41
photosystem I (PSI)
700nm
42
the 2 photosystems work together to
use light energy to generate ATP & NADPH
43
after light reactions there are 2 possible routes for electron flow
cyclic & noncyclic
44
noncyclic electron flow
- primary pathway - both photosystems - makes ATP & NADPH
45
cyclic electron flow
- photosystem I - produces ATP - generates extra ATP, satisfies higher demand in calvin cycle
46
what two structures generate ATP by chemiosmosis
chloroplast & mitrochondria
47
mitochondria
transfers chemical energy from food to ATP
48
chloroplast
light E -> ATP
49
calvin cycle uses ATP & NADH to convert ____ to sugar
CO2
50
Calvin cycle has 3 phases
- carbon fixation - reduction - regen of CO2 acceptor (RuBP)
51
what is carbon fixation catalyzed by
rubisco
52
how does carbon enter the calvin cycle?
as CO2
53
how does carbon leave the calvin cycle?
G3P (glyceraldehyde-3-phosphate)
54
how many cycles does it take to make one G3P
3 cycles => 3 molecules of CO2
55
what gets reduced in calvin cycle
NADH

Biol 1500 (10 decks)

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