Bellringer 3/30•What is the purpose of photosynthesis? •What does the plant need to perform

photosynthesis? •What are the products of photosynthesis?•What is the purpose of respiration? •What does an organism need to perform

cellular respiration? •What are the products of cellular

respiration? •What are the products of alcoholic

fermentation?

Why do organisms need food?

Organisms use food to make ATP

ATP (adenosine triphosphate) → the

molecule used for energy in ALL cells.

•When a cell needs to use energy, it breaks off one phosphate group to make

ADP release energy = ATP → ADP + P

•When a cell wants to store

energy, it makes ATPstore energy = ADP + P → ATP

What process makes ATP (energy)?

RESPIRATION!

•Chemical reaction that makes ATP for ALL organisms.

TWO types of respiration…

OR

Aerobic (Cellular)

Respiration

Anaerobic Respiration

(Fermentation)

Aerobic (Cellular) RespirationUses O2 and

food (glucose) to make ATP

Makes LOTS of ATP

Occurs in the MITOCHONDRI

A

All organisms except some

fungi and bacteria

Produces H2O and CO2

Energy Cell

Used by cell

OxygenNeed to get it from outside cell

Carbon DioxideExcreted out

Water

GlucoseGet from food

The PRODUCTS of one reaction are the REACTANTS of the other reaction.

In which way are photosynthesis and cellular respiration different?A. Cellular respiration stores ATP, while

photosynthesis releases ATP.B. Cellular respiration produces oxygen,

while photosynthesis uses oxygen.C. Photosynthesis releases energy, while

cellular respiration stores energy.D. Photosynthesis uses carbon dioxide,

while cellular respiration produces carbon dioxide.

Anaerobic Respiration (Fermentation)•Does NOT use Oxygen

•Uses ONLY food (glucose) to make ATP

•makes very little ATP

Fermentation (anaerobic respiration) can be…

LACTIC ACID•Occurs in humans

when there is a lack of O2

▫Result of pushing yourself beyond your usual endurance

•Produces lactic acid = muscle cramps

ALCOHOLIC•Occurs in yeast

•Produces CO2 and ethyl alcohol

Which organism is most likely to use anaerobic respiration?

A. BirdB. MossC. TreeD. Yeast

Two different species of bacteria are examined. Scientists find that Species X always produces CO2 and H2O during cellular respiration. Species Y always produces ethyl alcohol and CO2. Which conclusion can be made from these observations?

A. Only Species Y is aerobicB. Only Species Y is anaerobicC. Both Species X and Y are aerobicD. Both Species X and Y are anaerobic.

Bioenergetic ReactionsPhotosynthesisCO2 + H2O → C6H12O6 + O2

Carbon dioxide + water → glucose + oxygen

Aerobic Respiration

C6H12O6 + O2 → CO2 + H2O + 36 ATP

Glucose + oxygen → carbon dioxide + water

Anaerobic Respiration (Alcoholic Fermentation)

C6H12O6 → CO2 + C2H5OH + 2 ATP

glucose → carbon dioxide + ethyl alcohol