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AP Biology > Ch 10 > Flashcards

Ch 10 Flashcards

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1
Q

photosynthesis

A

the capture of light energy from the sun and its conversion to chemical energy that is stored in organic molecules like sugars

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2
Q

autotrophs

A

self-feeders

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3
Q

photoautotrophs

A

organisms that use light as a source of energy to synthesize organic substances

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4
Q

heterotrophs

A

live on compounds produced by other organisms

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5
Q

all green parts of a plant have

A

chloroplasts

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6
Q

mesophyll

A

the tissue in the interior of the leaf where most chloroplasts are found

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7
Q

stoma

A

greek for mouth

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8
Q

stomata

A

microscopic pores where oxygen leaves and CO2 enters

-main avenues of transpiration; the evaporative loss of water from leaves

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9
Q

veins in plants

A
  • water from roots takes to leaves

- exports sugar from leaves to nonphotosynthetic parts of plants

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10
Q

thylakoids

A

a membrane system suspended in the stroma made up of sacs which segregate the stroma from the thylakoid space inside the sacs

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11
Q

chloroplast

A
  • two envelopes surrounding a dense fluid called the stroma
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12
Q

chlorophyll

A
  • resides in the thylakoid membrane of the chloroplasts
  • gives plants green color
  • absorbs the light that drives photosynthesis
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13
Q

grana (singular granum)

A

stacks of thylakoids

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14
Q

photosynthesis formula for green plants

A 
6CO2+12H20+ light energy=C6H12O6+6O2+6H2O
or sans H2O
6CO2+6H20+ light energy=C6H12O6+6O2
then divided by 6
CO2+H20+ light energy=(CH2O)+O2
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15
Q

photosynthesis is __gonic, and explain

A

ender-, electrons increase in potential energy, water is split, and electrons are transferred along with hydrogen ions from water to CO2 reducing it to sugar, energy boost is provided by light

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16
Q

the two stages of photosynthesis

A

light reactions and the calvin cycle

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17
Q

light reactions (summary)

A
  • convert solar energy to chemical energy
  • water is split providing e- and protons (hydrogen ions, H+)
  • light absorbed by chlorophyll drives a transfer of electrons and H+ from water to an acceptor called NADP+
  • solar power reduces NADP+ to NADPH by adding a pair of electrons along with AN H+
  • phosphorylation
  • two chemical energy products ATP and NADPH
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18
Q

photophosphorylation

A

generation of ATP using chemiosmosis to power the addition of a phosphate group to ADP

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19
Q

calvin cycle

A

-begins by incorporating CO2 from air via carbon fixation

-

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20
Q

carbon fixation

A
  • initial incorporation of carbon into organic compounds
  • reduces the fixed carbon to carbohydrates by the addition of e-, reducing power is NADPH
  • what makes sugars
  • known as dark reactions or light-independent reactions
  • needs ATP and NADPH
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21
Q

wavelength

A

distance between crests of electromagnetic waves

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22
Q

electromagnetic spectrum

A

entire range of radiation nanometer (for gamma rays) to more than a kilometer (radio waves)

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23
Q

visible light

A

most important to life, can be detected by human eye

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24
Q

photons

A

“particles” of light, not tangible, have fixed energy quantity

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25
Q

atmosphere and light

A

filters out some radiation, not visible light

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26
Q

pigments

A

substances that absorb light

-different pigments absorb different wavelengths

27
Q

spectrophotometer

A

machine that measures the ability of a pigment to absorb various wavelengths of light, it directs beam of light of different wavelengths through a solution of a pigment and measures the fraction of the light transmitted at each wavelength

28
Q

absorption spectrum

A

a graph plotting a pigment’s light absorption versus wavelength

29
Q

3 types of pigments in chloroplasts

A
  • chlorophyll a-participates directly in light reactions works best with red and blue-violet light while green is worst-is blue green
  • chlorophyll b-accessory pigment absorbs blue green-is olive green
  • carotenoids- a group of accessory pigments, absorbs violet and blue green are yellow and orange
30
Q

active spectrum

A
  • profiles the relative effectiveness of different wavelengths of radiation in driving the process
  • prepared by illuminating chloroplasts with light of different colors and then plotting wavelengths against some measure of photosynthetic rate such as CO2 consumption or O2 emission
31
Q

photoprotection

A
  • important function of at least some carotenoids
  • absorption and dissipation of excessive light energy that would otherwise damage chlorophyll or react with oxygen
  • also are protective in human eyes
32
Q

2 parts of chlorophyll

A

porphyrin ring: light absorbing “head” of molecule; magnesium atom center
hydrocarbon tail: interacts with hydrophobic regions of proteins inside thylakoid membranes of chloroplasts; H atoms not shown

33
Q

differences between chlorophyll a and b

A

a: CH3
b: CHO

34
Q

phyton

A

greek for plant

35
Q

phyochemicals

A

-things plants can synthesize these antioxidants but we must consume them

36
Q

what occurs when a pigment is struck by a light

A
  • starts in ground state (electron in normal orbital)
  • absorption of photon boosts electron to higher orbital ; in an excited state (this state is unstable)
  • only photons absorbed are those whose energy is exactly equal to the difference between the ground state and the excited state
  • normally orbital re-drops and releases heat and sometimes light
  • chlorophyll will emit light when isolated
37
Q

photosytem

A

composed of a reaction-center complex surrounded by several light-harvesting complexes

  • is able to harvest light over larger area and spectrum than any individual pigment due to its array of pigments
  • when photon is absorbed by a pigment the energy travels from pigment to pigment to the reaction-center complex
  • there are two types
38
Q

reaction-center complex

A

an organized association of proteins holding a special pair of chlorophyll a molecules

  • has the primary electron acceptor
  • has pair of special chlorophyll a molecules which can transfer electrons to the primary electron acceptor in a redox reaction
39
Q

light harvesting complex

A

various pigment molecules (which may consist of chlorophylls a and b and carotenoids) bound to proteins

40
Q

primary electron acceptor

A

a molecule capable of accepting electron and becoming reduced

41
Q

two types of photosystems

A

PS II: (comes first) reaction-center chlorophyll a of is P680,as that is what it is best at absorbing, 680nm (red part)
PS I :reaction-center chlorophyll a of is P700,as that is what it is best at absorbing, 700nm (far red part)

42
Q

linear electron flow

A

flow of electrons through photosystems and other components in the thylakoid membrane

43
Q

steps of linear electron flow

A
  1. photon strikes a pigment in a light harvesting complex of PS II boosting one of its electrons, as it drops another pigment’s e- goes up, continues until P680 pair is reached in reaction center complex of PS II, exciting an e- in this pair
  2. e- is transferred from P680 to the primary electron receptor, leaving it P680+
  3. an enzyme catalyzes the splitting of water into 2 e-, 2 H+, and an Oxygen atom. The electrons are supplied one by one to P68+ to replace the e- it just gave up. the H+ are released into thylakoid lumen, oxygen joins another one into O2
  4. each excited electron then passes to PS I via an etc made of the e- carrier plastoquinone (Pq), a cytochrome complex, and plastocyanin (Pc) protein
  5. fall of electrons to lower energy level, provides energy for ATP synthesis. As e- pass through cytochrome complex, H+ are pumped into thylakoid lumen contributing to proton gradient in chemiosmosis
  6. meanwhile light energy is transferred to PS1’s P700 pair, e- then transferred to PS I’s primary electron receptor, leaving it P700+
  7. e- are passed in redox reactions from the primary e- receptor down a second etc through the protein ferredoxin (Fd) (chain does not produce ATP)
  8. enzyme NADP+ reductase catalyzes the transfer of electrons from Fd to NADP+. 2 electrons are needed for its reduction to NADPH. molecule has higher energy level than water; more suitable for calvin cycle, removes H+ from stroma
44
Q

cyclic electron flow

A

alternate path which uses photosystem I but not II.

  • Fd contributes e- and begins cytochrome complex; repeats cycle from there; produces ATP but not NADPH
  • vestigial, but beneficial for low light environment
45
Q

chemiosmosis in photosynthesis differences

A
  • source of electrons is water
  • phosphorylation is different
  • remember that ATP is produced as well
  • gradient maintained by Photosyetem II and Cytochrome
46
Q

calvin cycle is __bolic

A

ana-

47
Q

carbon enters calvin cycle enters as CO2

A

and leaves as as sugar

48
Q

what does the calvin cycle use

A
  • it spends ATP as an energy source

- consumes NADPH as reducing power for adding high energy elcectrons to make the sugar

49
Q

products directly from calvin cycle and how many times must the cycle run for it

A

-NOT glucose but a 3-carbon sugar: glyceraldehyde 3-phosphate (G3P); 3 times ; fixing 3 molecules of CO2
-9ADP
-6 inorganic phosphate
-6NADPH
(REMEBER ALL THESE NUMBERS ARE FOR 3 GLUCOSE)

50
Q

3 phases of calvin cycle

A
  1. carbon fixation
  2. reduction
  3. regeneration of the CO2 acceptor (RuBP)
51
Q

Carbon fixation in calvin cycle

A

calvin cycle incoroporates each CO2, one at a time, by attaching it to a 5-carbon sugar called ribulose biphosphate (RuBP) catalyzed by an enzyme called RuBP carboxylase (rubisco). (most abundant protein on earth) the product is a 6-carbon sugar so unstable it immediately splits in half into two molecules of 3-phosphoglycerate (for each CO2)

52
Q

Reduction in calvin cycle

A

each 3-phosphoglycerate receives a phosphate group from ATP becoming 1,3 biphosphoglycerate . Next a pair of electrons donated from NADPH reduces a carboxyl group on 1,3 biphosphoglycerate to the aldehyde group of G3P. G3P is a 3 carbon sugar. 1 G3P leaves but 5 must stay (for 3 CO2)

53
Q

Regeneration of the CO2 acceptor (RuBP)

A

in a series of reactions, the carbon skeletons of five molecules of G3P are rearranged by the last steps of the calvin cycle into three molecules RuBP. This spends 3 more ATP. The RuBP is now ready for more CO2 and to repeat the cycle

54
Q

photosynthesis is an ___property of the intact chloroplast

A

emergent

55
Q

on hot dry days most plants

A

close their stomata

56
Q

C3 plants

A

product is a 3 carbon compound, 3 phosphoglycerate
most plants
on hot days photorespirate

57
Q

photorespiration

A
  • O2 used instead of CO2
  • no ATP produced
  • consumes ATP
  • no sugar produced
  • decreases photosynthetic output
  • reduces damage to excess light
  • may be vestigial
58
Q

plant adaptations to hot environments

A
  • C4 photosynthesis

- crassulacean acid metabolism (CAM)

59
Q

C4 plants

A
  • forms 4 carbon product

- two types of cells; bundle-sheath and mesophyll

60
Q

bundle sheath cells

A

arranged in tightly packed sheaths around the veins in the leaf,

  • mesophyll cells are between bundle sheaths and veins
  • calvin cycle confined to bundle-sheath cells but is preceded by incorporation of CO2 into organic compounds in the mesophyll cells
61
Q

C4 pathway

A
  1. in mesophyll cells, the enzyme PEP carboxylase adds CO2 to PEP
  2. a four carbon compound conveys the atoms of the CO2 into a bundle-sheath cell via plasmodesmata
  3. in bundle-sheath cells CO2is released and enters the Calvin cycle , extra ATP needed comes from cyclic electron flow
62
Q

crassulacean acid metabolism (CAM)

A
  • many succulents (water storing plants) open their stomata during the night and close them at night
  • incorporate CO2 from night into organic acids
  • organic acids stored in vacuoles of mesophyll cells
63
Q

CAM cycle

A

1.preliminary incorporation of CO2 into organic acids
2.transfer of CO2 to the calvin cycle
(all occurs in same cell, other than that though, identical to C4 pathway)

AP Biology (13 decks)

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