photosynthesis part2 Flashcards

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1
Q

how do photosynthetic pigments absorb specific wavelenths of light energy

A

-e- in chlorophyll absorb a photon of light
-photoon of the right energy level (wavelength) excites e- to a higher energy orbital
-e- emits energy as it returns to lower energy state

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2
Q

what can neighboring pigemnt molecules do with each other

A

can pass energy from one pigment to another (CHECK IMAGE ON NOTES)

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3
Q

what do most pigment moleqs compose

A

the photosystems antenna complex or light harvesting complex

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4
Q

what are pigments organized into

A

complexes called photosystems that optimize the transfer of energy

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5
Q

pigment molecules and proteins make up

A

a photosystem

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6
Q

a pair of specialized chlorophyll a moleq are the only what

A

only chlorophyll moleqs that can give up their e- to another moleq

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7
Q

what does the primary e- acceptor protein receive

A

e- from those specialized chlorphyll moleq

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8
Q

what is a rxn center

A

a protein pigment complex that includes 2 specialized chlorophyll a moleqs that can donate e- to to the receiving protein

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9
Q

what does the primary e- acceptor in rxn accepts

A

e- and its reduced as a result

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10
Q

first protein in an

A

etc

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11
Q

what does the primary e- acceptor donate

A

the e- to the next protein in the ETC

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12
Q

check two images for texts representation of photosystem vs ribbon model

A

ok

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13
Q

the two photosystmems (I and II) are embedded where

A

in thylakoid membranes that function in photosynthesis

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14
Q

the two photosystems differ hiw

A

in theur reaction center chlorophylls

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15
Q

what links the two photosystems together

A

one ETC links the two together

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16
Q

what does the second ETC do with photosystem I

A

another delivers e- to NADP+ to make NADPH

17
Q

what are associated with two photosystems

A

two short ETC

18
Q

light energy drives….? what is is absorbed by?

A

drives the syntehsis of NADPH and ATP and aborbsed by the pugments in the antenna complex

19
Q

what resupplies the e- needed for PS II for the synthesis of NADPH

A

H2O

H2O -> O2 + e- + H+

20
Q

electron flow from PS II to I also leads to what

A

synthesis of ATP by chemiososomos

21
Q

stroma pH =

A

8

22
Q

thylakoid lumen pH =

A

5

23
Q

e- flow in photosystems is just like what?

A

like it is in mitochondria. e- flow (exergonic process) provides energy to pump H+ across a membrane (endergonic process) against [] gradient

24
Q

proton flow in photosynthesis is juts like

A

in mitochondria: proton flow through ATP synthase compelx (exergonic) provides the energy to synthesize ATP from ADP and Pi (endergonic)

25
Q

light rxns generate what

A

ATP and inc the potential energy of e- by moving them from H2O to NADPH

26
Q

where are ATP and NADPH produced

A

on the side facing the stroma where the calvin cycle takes place

27
Q

ATP is made by ___________
-using what?
-focus is on what?

A

photophosphorylation
-using light energy to synthesize ATP form ADP and Pi
-focus on ultimate source of energy for making ATP

28
Q

what is ATP also made by besides photophosphorylation?
-using
-where else

A

chemiosmosis
-uses protons motive force of diffusing H+ to provide the energy for synthesizing ATP from ADP and Pi
-also made by chemiosmosis in mitochondria during aerobic respiration

29
Q

ATP is made by photophosphorylation and chemisosis. Which is true?

A

both are true. one term focuses on the original source of energy while the other focuses on the mechanisms by whic the ATP is made