john a. ferguson senior high school€¦ · web view2019/12/02  · photosynthetic organisms...

What role do pigments play in the process of photosynthesis?

Photosynthetic organisms capture energy from sunlight with pigments.

Photon a packet of light energy.

White light is composed of ROYGBIV.

Green light is not absorbed by pigments but Violet and red are the most absorbed.

Pigment –light absorbing molecule

Chlorophyll- principle pigment found in chloroplast to make ATP

The two types of chlorophyll found in plants, chlorophyll a and chlorophyll b, absorb light very well in the blue-violet and red regions of the visible spectrum, but not in the green region, as shown in the graph. Leaves reflect green light, which is why plants look green.

Granum- several thylakoids

Thylakoid- a single disc where photosynthesis takes place (Light reaction)

Stroma- the space (cellular fluid) within the chloroplast (dark reaction)

ATP

The ATP is adenosine Triphosphate

Aden-(adenine base) Osine-(ribose sugar) Tri-( three) Phosphate- (the compound phosphate)

The energy is in the bond

How is ATP used in body?

Stores energy Releases energy Biochemical reactions

a) Movementb) Digestionc) Nervous systemd) Transportatione) Enzymatic Reactions

Bigger BatteryNADPH is equal to 3 ATP

NADP+ (nicotinamide adenine dinucleotide phosphate) is a carrier molecule.a. NADP+ accepts and holds two high-energy electrons, along with a hydrogen ion (H+). In this way, it is converted into

NADPH.b. The NADPH can then carry the high-energy electrons to chemical reactions elsewhere in the cell.

Photosynthesis

Carbon dioxide enters the cycle

Sugar is made and oxygen released

Uses light energy to recharge batteries