A LOOK INTO CELLULAR RESPIRATION
All organisms need a source of energy
and a source of Carbon!
WHAT IS A HETEROTROPH?
An organism that needs to CONSUME something for
food/energy
WHAT SUBSTANCE IS REQUIRED FOR CELLULAR RESPIRATION TO OCCUR?
Glucose
WHERE DOES GLUCOSE COME FROM?
Photosynthesis
SOOOO…•In order for a heterotroph to obtain energy, plants must undergo photosynthesis, producing glucose for use in cellular respiration.•B.T.W. Autotrophs also carry out cellular respiration because ATP cannot be stored
Let’s Look at the Big Picture
What is the equation for Cellular Respiration?
C6H12O6 + 6 O6 → 6 CO2 + 6 H2O + ATP
CELLULAR RESPIRATION PRODUCES ATP. WHAT MOLECULE DO YOU THINK IS NEEDED FOR
CELLULAR RESPIRATION TO OCCUR?
Ummmm…Oxygen?
But WAIT! What if there’s no oxygen present???
Hello. My name is
Saccharomyces cerevisae!
My friends call me Yeast
ANAEROBIC CELLULAR RESPIRATION.
NO Oxygen is present!
STEP 1: GLYCOLYSIS- OCCURS IN THE CYTOPLASM OF THE
CELLGlyco = sugarLysis = split
Glycolysis =The splitting of Glucose
Glycolysis Animation
Let’s look at that again!
STEP 2: FERMENTATION
ONLY occurs if Oxygen is not present, causing the pyruvates to
stay in the cytoplasm and ferment, or rearranges it into…
LACTIC ACIDThat’s me!
And me!
And me!
LACTIC ACID
OR ETHYL ALCOHOL AND CO2
Hola! It’s me again…
THIS IS CALLED ANAEROBIC CELLULAR RESPIRATION, OR JUST
FERMENTATION, FOR SHORT.
video
Aq uila c hrysa e to s
I love Oxygen.
BUT WHAT IF OXYGEN IS PRESENT???
Whoo hoo! We get to practice AEROBIC
Cellular Respiration!
…which is WAY more efficient!...Let’s learn more !!!
STEP 1: GLYCOLYSISRemember?
The function of the Krebs Cycle- to further the breakdown of the products of glycolysis-
releasing CO2 and creating ATP. NAD+ and
FAD+ are reduced to create NADH and
FADH2, these molecules are used during the
next stage…
http://www.bio.miami.edu/~cmallery/150/makeatp/pyraerobic.jpg
Step 2: The pyruvates enter the mitochondrial matrix,
and participate in the Krebs Cycle
Step 3: The Electron Transport System (a.k.a. Oxidative Phosphorylation)
Oxidative Phosphorylation occurs on the inner mitochondrial membrane
NADH and FADH2 (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!ATP synthase