19. Photosynthesis without photorespiration

Photosynthesis ___ sun rays

absorbed

Where are the photosynthetic pigments located in a plant?

The thylakoid membrane

Chlorophyll pigment color

green

Carotenoids pigment colors

yellow and orange

Phycobilin and Phycoerythrin pigment color

red

How are plants green

all the other colors become absorbed while green is being reflected

Describe photoexcitation once photon light hits molecule

Molecule absorbs photon, goes to an excited state, but it is unstable so it goes to ground state and releases energy

Where is absorbed light energy converted/stored (2)

- ATP: to provide energy to drive anabolic reactions
- NADPH: provides electrons needed to produce CO2

Photosystems

chlorophylls and pigments are spread out to have a wider range to absorb light

- in thylakoid membrane

PS I - P___ Pigment
PS II - P___ Pigment

P700
P680

water splitting complex

H2O becomes oxidized and gives electrons to p680 in PSII

PQ is similar to ___. It transfers electrons from _ and _ to _

CoQ

1 and 2 to 3

Cyto B6 similar to ___.

respiratory complex III

PC similar to ___. It transfers electrons to ___

Cyto C. Cyto B6

Cyto B6

- pumps protons across thylakoid membrane to build a proton gradient

What is needed for chemiosmosis

- membrane compartment
- proton gradient
- atp synthase complex

Phosphorylation

Conversion of ADP to ATP using sunlight in PSII

Where is atp made in photosynthesis

stroma of the thylakoid membrane

What does PSII and PSI do

2: generate ATP and oxygen
1: Energize electrons to reduce NADP