Energy in a CellPART2

Predict:

Why do we breathe?!

Why do we eat what plants produce?

Heterotrophs

AKA consumers Eat autotrophs =

starch enters their food chain.

They must eat (consume) to produce energy molecules during the process of cellular respiration

Different Pathways

There are two main pathways to release energy from glucose

The amount of oxygen available controls the pathway

– Aerobic Respiration (with oxygen) = Cellular Respiration

– Anaerobic Respiration (without oxygen) = Fermentation

Picture of Pathway

Glycolysis

Lots

of Oxy

gen

Not enough Oxygen

Cellular Respiration Alcoholic Fermentation

Lactic Acid Fermentation

Aerobic Respiration

Anaerobic Respiration

Net 36 ATP Net 2 ATP

Turn to a shoulder partner and use the diagram in your notes to complete the following sentence stem:

One difference between the twopossible pathways for cellular

respiration is …

What is Cellular Respiration?

Process of converting chemical energy of food molecules (in the presence of oxygen) into chemical energy storage molecules of ATP

Cellular Respiration

Using Oxygen to break apart food molecules (sugars)

Takes place in the mitochondria Produces lots of ATP and releases CO2 and

H2O as byproducts Muscles will do this as long as they don’t

run out of oxygen Cellular Respiration

C6H12O6 + 6O2 -------- 6H2O + 6CO2 + ATP

Cell Respiration

6 O2 + C6H12O6 --> 6 CO2 + 6 H20

6 oxygen molecules+ 6 glucose molecules react to produce 6 carbon dioxide molecules + 6 water molecules

Mitochondria

All eukaryotes (including autotrophs) have mitochondria.

Cellular respiration occurs in the mitochondria of the cell.– Bacteria do not have mitochondria,

but they have the ability to break down sugars in their cytoplasm.

3 Stages of Cellular Respiration1. Glycolysis (Anaerobic) 2ATP

molecules2. Krebs Cycle (Aerobic) 2ATP

molecules3. Electron Transport Chain (Aerobic)

32 ATP molecules

Each stage captures some of the chemical energy available in food molecules and uses it to produce

ATP

= 2 = 2 = 32

What does all this mean?

Glucose is produced by converting the suns energy

Glucose is transported into the cells (active transport)

Glucose is broken down by hydrolysis =GLYCOLYSIS

*A new molecule is produced =ATP* The 2 molecules from glycolysis go to the

mitochondria• More energy is made = Krebs cycle• Finally, ATP is produced in the highest amount in

the membrane of the mitochondria = Electron transport chain

• Result = ATP, H2O, CO2

What exactly is ATP?

Cellular respiration is the primary way of making ATP molecules from simple sugars.

How are simple sugars made?

What exactly is ATP?

Adenosine triphosphate – the energy storage molecule

Adenosine

3 Phosphates

Energy storage

Getting energy out of ATP

ATP Bond is broken

releasing energy and

a phosphate

group forming

ADP

ADP

Phosphate group is

bonded to ADP

molecule storing

energy in ATP

ENERGY RELEASED!

Adenosine

Phosphate

Photosynthesis vs. Respiration

Photosynthesis and cellular respiration take place in opposite directions!

Photosynthesis: Use light energy to build a sugar.carbon dioxide + water + light energy → sugars

+ oxygen

Respiration: Break down sugar to release energy.oxygen + sugars → carbon dioxide + water +

energy

SO, what process(es) do plants do?!!

Card Sort

With your partner, match the cards to the proper word(s)!

Raise your hand to be checked.

Exit Ticket:

With sufficient sunlight, is it possible to suffocate a plant? Explain!