Heterotrophy- a look into Cellular Respiration

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All organisms need a source of energy and a source of Carbon!

An organism that needs to

CONSUME something for food/energy

Glucose

Photosynthesis

In order for a heterotroph to obtain energy, plants must undergo photosynthesis, producing glucose for use in cellular respiration.

Ummmm

…Oxygen?

Hello. My name is Saccharomyces

cerevisae! My friends call me

Yeast

NO Oxygen is present!

Glyco = sugar

Lysis = split

Glycolysis =The splitting of Glucose

Glycolysis Animation

Let’s look at that again!

ONLY occurs if Oxygen is not present, causing the pyruvates to stay in the cytoplasm and ferment, or rearranges it into…

LACTIC ACID

That’s me!

And me!

And me!

Hola! It’s me again…

Got it? Let’s see what this looks like!

BUT WHAT IF OXYGEN IS

PRESENT???

Aquila c hrysaetos

I love Oxygen.

Whoo hoo!

We get to practice AEROBIC

Cellular Respiration!

…which is

WAY more efficient!...

Let’s learn more !!!

Remember?

Step 2: The pyruvates enter the mitochondrial matrix, and participate in the Krebs Cycle http://www.bio.miami.edu/~cmallery/150/ma keatp/pyraerobic.jpg

The function of the Krebs

Cycle- to further the breakdown of the products of glycolysisreleasing CO

2 and creating

ATP. NAD + and FAD + are reduced to create NADH and FADH

2

, these molecules are used during the next stage…

Oxidative Phosphorylation occurs on the inner mitochondrial membrane

NADH and FADH

2

(from the Krebs Cycle) are oxidized, releasing H+ that are pumped across the membrane and create ATP…and LOTS of it!

Let’s see what that looks like!

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