lesson 7 photosynthesis organisms

Question 1

what is photosyntehsis

Answer 1

it consists of two sets of reactions
- photo: light dependent reacts that capture light energy
- synthesis: light independent reacts that produce a carbohydrate(g3p)
6co2 + 6h20 + light energy –> glucose + oxygen

Question 2

chlorophyll a vs b

Answer 2

a has a methyl group at r position
b has a aldehyde (-COH) group
- affects the type of light energy (wavelength) absorbed

Question 3

whats chlorophyll

Answer 3

• green pigment
  a pigment is a compund that abosrbs certain wavelengths of light while reflecting others
• absorbs light energy
  several types
  chlorophyll a (blue green)
  chlorphyll b (yellow green)

Question 4

chlorophyll molecular compositon

Answer 4

• a porphyrin ring
  Mg atom surrounded by a hydrocarbon ring
  electrons absorb light energy and begin photosythesis
• contains long hydrocarbon tail called phytol
  the hydrocarbon tail is nonpolar and anchors the molecuel in the membranes

Question 5

whats the chlorophyll structure?

Answer 5

contains outer membrane, granum, lumen, thylakoids, inner membrane and stroma

has a double lipid membrane
interior is filled with stroma
membrane bound thylakoids sacs within stroma

Question 6

where does photosynthesis occur

Answer 6

thlakoid membrane (light dependent rxns (chlorophyll is embedded in the thylakoid membranes)
stroma (light independent rxns