DAT Photosynthesis Cheat Sheet

Question 1

what absorbs energy from sunlight

Answer 1

Chlorophyll A, B, and carotenoids

Question 2

what excites the electrons

Answer 2

photons

Question 3

what is energy absorbed by

Answer 3

by Chlorophyll A molecules, P680 (PSII) & P700 (PSI)

Question 4

the two overall reactions of photosynthesis are..

Answer 4

light rxns and dark rxns (aka Calvin cycle)

Question 5

what are electrons trapped by in light rxn

Answer 5

photosystem ii

Question 6

what are the excited e- passed to

Answer 6

a primary e- acceptor

Question 7

where do primary e- acceptors go to

Answer 7

move thru the ETC

Question 8

what happens to the 2e- from the primary electron acceprot

Answer 8

lose their energy, used to form about 1.5 ATP

Question 9

where does the ETC end

Answer 9

PSi

Question 10

Cyclic Phosphorylation

Answer 10

2 e- from PSI go back through the
1st ETC and generate 1 ATP

Question 11

Non-Cyclic Phosphorylation

Answer 11

2 e- go through an ETC and
combine with NADP+ & H+ to
form NADPH

Question 12

what is NADH from non cyclic used for

Answer 12

in Calvin cycle to create glucose

Question 13

purpose of Calvin cycle

Answer 13

Fixes Carbon Dioxide (CO2) into glucose (2 G3P).

Question 14

Carboxylation: rxn

Answer 14

6 CO2 + 6 RuBP à 12 PGA

Question 15

what is carboxylation catalyzed by

Answer 15

RuBisCO

Question 16

Reduction:

Answer 16

12 ATP + 12 NADPH converts 12 PGA to 12 G3P or
12PGAL

Question 17

Regeneration:

Answer 17

6 ATP convert 10 G3P to 6RuBP

Question 18

steps of Calvin cycle

Answer 18

carboxylation, reduction, regeneration, carbohydrate synthesis

Question 19

Chloroplasts are highly
effective at absorbing what colors

Answer 19

red and blue light

Question 20

Photolysis

Answer 20

H2O splits into 2H+, 2e-
, and 1⁄2 O2.

Question 21

where does photolysis occur

Answer 21

PSii

Question 22

what membrane does chemoosmosis occur at

Answer 22

thylakoid membrane

Question 23

what is chemosmosis

Answer 23

Uses H+ gradient to create ATP.

Question 24

where does H+ accumulate in chemiosmosis

Answer 24

thylakoid lumen

Question 25

by what process is H+ released into the lumen during chemiosmosis

Answer 25

photolysis

Question 26

what does C4 Photosynthesis do

Answer 26

alters location of photosynthesis

Question 27

where and why is CO2 moved to for C4 Photosynthesis

Answer 27

bundle sheath cells to minimize photorespiration & H2O loss

Question 28

what does CAM Photosynthesis do

Answer 28

Alters timing of photosynthesis

Question 29

what timing and why is changed during CAM photosynthesis

Answer 29

Fixes CO2 at night instead of
day to minimize
photorespiration & H2O loss

Question 30

what does photosynthesis take place in

Answer 30

chloroplast

Question 31

Granum

Answer 31

– Stacks of thylakoids

Question 32

Thylakoid Membrane

Answer 32

– Location of the ETC (Non-Cyclic Photophosphorylation)

Question 33

Thylakoid lumen

Answer 33

– Location of photolysis. H+ ions accumulates due to ETC

Question 34

Stroma

Answer 34

– Location of the Calvin Cycle

Question 35

stroma lamellae

Answer 35

location of cyclic phosphorylation