Photosynthesis and cellular respiration

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PHOTOSYNTHESIS

“PHOTOSYNTHESIS NOT FUNNY”

HTTP://WWW.YOUTUBE.COM/WATCH?V=HRGRHTW9S1S

IT’S ALL IN THE CHLOROPLAST!

PHOTOSYNTHESIS OCCURS IN CHLOROPLASTS IN LEAVES OF GREEN

PLANTS**The green pigment chlorophyll traps the sun’s energy**A series of reactions use this radiant energy and converts it to chemical energy

CHEMICAL EQUATION FOR PHOTOSYNTHESIS

Along with energy from the sun, six molecules of carbon dioxide

react with six molecules of water to form 1 molecule of glucose and

six molecules of oxygen.

RATES OF PHOTOSYNTHESIS ARE AFFECTED BY:

Availability of Water (a Reactant)

Sunlight availability (Energy source); greater the amount of sunlight, the greater the rate…to a point

Available Nutrients (Needed for proper growth and development)

Carbon Dioxide Gas Availability(A Reactant; great amount increases rate..to a point

pH of water and soil

CELLULAR RESPIRATION

TWO TYPES OF CELLULAR RESPIRATION

Aerobic respiration and Anaerobic respiration. Both produce ATP. How much depends on oxygen levels!

1.) Aerobic respiration occurs when oxygen is available and is more efficient than anaerobic. The process produces a great deal of ATP (about 36) which gives you energy!!

2.) Anaerobic respiration occurs when there is no available oxygen. It is less efficient than aerobic as only 2 ATP molecules are produced

WHAT IS ATP???• Stands for adenosine

triphosphate• Bonds between phosphates of

ATP have a great deal of stored energy

• When a bond breaks, by an enzyme (ATPase), energy is released and can be used in cell processes

• After the molecule loses it’s phosphate, another enzyme (ATP synthase) bonds another phosphate creating another ATP molecule!

Adenine Molecule

Sugar molecule called Ribose

3 Phosphates

AEROBIC RESPIRATION IN THE MITICHONDRIA

AEROBIC RESPIRATION

Occurs when cells need energy Glucose polymers (such as in your glycogen, or a plant’s starch)

are broken down into smaller, glucose molecules The glucose molecules are then broken down in a series of more

reactions that create energy in the form of ATP For every glucose molecule, about 36 ATP are produced!

(1 glucose molecule + 6 oxygen molecules yields 6 carbon dioxide molecules, 6 water molecules and ATP

Energy!!! (About 36

ATP)

RATES OF CELLULAR RESPIRATION ARE AFFECTED BY:

pH – depends on the environment the cell that is respiring is in!

Temperature; as it increases, the rate increases…to a point (too hot and enzymes denature!)

Available oxygen – greater levels increase the process, but not too much!!

ANAEROBIC RESPIRATION

•2 Types; both occur in the cytosol of the cytoplasm

1.) Alcoholic Fermentation (from yeast and plants; top equation)

2.) Lactic Acid Fermentation (in animals; bottom equation) makes your muscles sore during exercise

***If you look at both reactions, there is no oxygen as reactant!!

COMPARE

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PHOTOSYNTHESIS AND AEROBIC CELLULAR RESPIRATION

• Photosynthesis makes the food, and requires energy while cellular respiration breaks it down and gives off energy! (ATP)

• The equations are opposite!! But the sun is not needed for cellular respiration!

Sugar (Glucose)

Sugar (Glucose)

*Cycle of the two processes