Photosynthesis and Cell Respiration

Dra. Paulina Trigo Espejel

Life Sciences

TEC-CEM

Sep. 2011

Remember?Ability to generate

work

Remember again?Autotrophs

Heterotrophs

¿Why is energy stored?

Which fuel do living beings use?

Adenosine Ribose Phosphate Groups

ATP is used for active membrane transport

ADP &ATP are like the

batteries of the cell.

Research!

• Find other activities in which ATP is required. Write as many as you can on this class summary.

Photo what?

Photosynthesis

Process

Autotrophs

+ CO2 + H2O = Energy + O2

Remember carbohydrate

functions?

* On your book look for the general formula for photosyntesis.

What does photosynthesis needs?

• Water• CO2• Light • chlorophyll-------- Chloroplasts

Pigments: Do you know any other pigment?

A Chloroplast?!!!!¨*¨¨¨¨

• Where photosynthesis takes place• Cointains tilakoids which organize photosystems. • They also contain chlorophyll

Nambe the parts of the chloroplast.

How does photosyntesis takes place?

Photosynthesis

includes

from

Takes place inTakes place uses

produce produce

uses

Light depndentreactions

Calvin Cycle

membranes Stroma NADPHATPSolar

ATP NADPH O2 Chloroplasts High energyCH’s

NADP?

• Try to say it’s name very fast

Transports two

electrons and a

hydrogen

High energy!

NADPH

This can free energy obtained from NADP.

Wasn´t there a light dependent reaction????

Describe what happens in each step.

Mention the differences between

photosystems I and II

Which was the one that didn´t require light?

CO2 Enters the cycleEnergy enters

New 6 carbonmolecules

Carbohydrates

A 6 carbon sugar is produced

Also called Calvin Cycle

Calories make you fat?

• A calorie is the energy requiered to heat 1 g of water 1 oC

Calories in food labels are referred as a C this actually means

kilocalories.

Just for fun check the labels on what you eat and try to figure out how many calories you eat.

How do human beings get energy?

Glucose

Glucolysis Krebs

Electron(transport)

FermentationAlcohol or

Lactic acid

What would happen if instead of freeing energy in a controlled way it was released sudedenly and uncontrolled?

Gluco…what????....

Gluco Lysis6 carbons sugar Divide, destroy

This process consumes 2 ATP’s

but produces 4.

It also produces NADH

Krebs Cycle (citric acid)

Electron transport chain

Electron TransportHydrogen Ion Movement

ATP Production

ATP synthase

Channel

No oxygen!!!!

Sportsmen produce large amounts of

lactic acid, research and find out how the

eliminate it.