photosynthesis part2

Question 1

how do photosynthetic pigments absorb specific wavelenths of light energy

Answer 1

-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

Question 2

what can neighboring pigemnt molecules do with each other

Answer 2

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

Question 3

what do most pigment moleqs compose

Answer 3

the photosystems antenna complex or light harvesting complex

Question 4

what are pigments organized into

Answer 4

complexes called photosystems that optimize the transfer of energy

Question 5

pigment molecules and proteins make up

Answer 5

a photosystem

Question 6

a pair of specialized chlorophyll a moleq are the only what

Answer 6

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

Question 7

what does the primary e- acceptor protein receive

Answer 7

e- from those specialized chlorphyll moleq

Question 8

what is a rxn center

Answer 8

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

Question 9

what does the primary e- acceptor in rxn accepts

Answer 9

e- and its reduced as a result

Question 10

first protein in an

Answer 10

etc

Question 11

what does the primary e- acceptor donate

Answer 11

the e- to the next protein in the ETC

Question 12

check two images for texts representation of photosystem vs ribbon model

Answer 12

ok

Question 13

the two photosystmems (I and II) are embedded where

Answer 13

in thylakoid membranes that function in photosynthesis

Question 14

the two photosystems differ hiw

Answer 14

in theur reaction center chlorophylls

Question 15

what links the two photosystems together

Answer 15

one ETC links the two together

Question 16

what does the second ETC do with photosystem I

Answer 16

another delivers e- to NADP+ to make NADPH

Question 17

what are associated with two photosystems

Answer 17

two short ETC

Question 18

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

Answer 18

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

Question 19

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

Answer 19

H2O

H2O -> O2 + e- + H+

Question 20

electron flow from PS II to I also leads to what

Answer 20

synthesis of ATP by chemiososomos

Question 21

stroma pH =

Answer 21

8

Question 22

thylakoid lumen pH =

Answer 22

5

Question 23

e- flow in photosystems is just like what?

Answer 23

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

Question 24

proton flow in photosynthesis is juts like

Answer 24

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

Question 25

light rxns generate what

Answer 25

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

Question 26

where are ATP and NADPH produced

Answer 26

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

Question 27

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

Answer 27

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

Question 28

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

Answer 28

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

Question 29

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

Answer 29

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