The On-Going Quest for Energy!

i.i. The Big PictureThe Big Picture

1.1. Life needs energy.Life needs energy.

2.2. To make energy, 3 things are To make energy, 3 things are required:required:

- sugar (glucose)- sugar (glucose)

- oxygen- oxygen

- enzymes- enzymes

I.I. PhotosynthesisPhotosynthesisA.A. The Quest for SugarThe Quest for Sugar

1.1. Plants make their own glucose Plants make their own glucose (autotrophic)(autotrophic)

a.a. requires energy from sunrequires energy from sun

b.b. requires raw materialsrequires raw materials

1.1. C, H, O C, H, O C C66HH1212OO66

66 COCO22 + + 66 H H22O O C C66HH1212OO66 + + 6 6 OO22

I.I. PhotosynthesisPhotosynthesisA.A. The Quest for SugarThe Quest for Sugar

2.2. Two essential steps:Two essential steps:

a.a. 11stst make energy make energy

b.b. 22ndnd use that energy to use that energy to break up break up raw materials and raw materials and synthesize synthesize glucoseglucose

I.I. PhotosynthesisPhotosynthesisB.B. How Plants Do It!How Plants Do It!

1.1. Light Dependent ReactionsLight Dependent Reactions

a.a. light strikes chlorophylllight strikes chlorophyll

b.b. knocks loose some eknocks loose some e--’s’s

c.c. ee-- fall down “Electron fall down “Electron Transport Transport Chain” Chain” (like a set (like a set of stairs)of stairs)

1.1. each step releases each step releases ATPATP

I.I. PhotosynthesisPhotosynthesisB.B. How Plants Do It!How Plants Do It!

d.d. ATP used for:ATP used for:

1.1. carbon fixationcarbon fixation

a.a. breaking C out of breaking C out of COCO22 (making it (making it more usable)more usable)

2.2. photolysisphotolysis

a.a. splitting watersplitting water

RAW MATERIALS:

CO2 (air), H2O (ground) SUN

e- e- e- e-

Electron Transport Chain

Light Dependent Reactions

Light Independent Reactions

C, O

H, O

ATP

I.I. PhotosynthesisPhotosynthesisB.B. How Plants Do It!How Plants Do It!

2.2. Light Independent ReactionsLight Independent Reactions

a.a. series of reactions that series of reactions that reassemble all C’s, reassemble all C’s,

H’s, H’s, and O’s and O’s into into CC66HH1212OO66

1.1. these reactions are these reactions are called the Calvin called the Calvin

Cycle”Cycle”

II.II. ATPATP

A.A. What is it?What is it?

1.1. Adenosine Tri-Phosphate (ATP)Adenosine Tri-Phosphate (ATP)

a.a. molecule containing molecule containing readily readily available energy available energy to perform to perform cellular workcellular work

II.II. ATPATP

B.B. How does it work?How does it work?

1.1. Releases a burst of energy Releases a burst of energy when when one Pone P-- is broken off is broken off

Adenosine-P-P-P Adenosine-P-P + PATPase

Adenosine-P-P-P Adenosine-P-P + P

ATP Synthase

III.III. Cellular RespirationCellular Respiration

A.A. HandoutHandout