CELLULAR RESPIRATION
Ms. Scerra
DO NOW
This is a review of photosynthesis, in order for you to understand
cellular respiration.
• How do Autotrophs obtain energy?
• How do Heterotrophs obtain energy?
• True or False:
• After we produce energy it is destroyed when we use
it.
• Cellular Respiration only occurs in animals
CELLULAR RESPIRATION DEFINITION
• The catabolic pathway in which organic molecules are
broken down to release energy for use by the cell.
• Oxygen is used to break down organic molecules
(glucose).
𝑪𝟔 𝑯𝟏𝟐 𝑶𝟔 + 𝟔𝑶𝟐 → 𝟔𝑪𝑶𝟐 + 𝟔𝑯𝟐 𝑶 + 𝑬𝒏𝒆𝒓𝒈𝒚
HOW DOES CELLULAR RESPIRATION
COMPARE TO PHOTOSYNTHESIS?
Photosynthesis
Cellular Respiration
• Inputs and Outputs
• Inputs and Outputs
• End Game
• End Game
• Cellular Formula
• Cellular Formula
• Differences
• Similarities
CLOTHESPIN
ACTIVITY
Do not begin until I tell you to do so.
1. How do your fingers feel?
2. Why?
BIOLOGICAL PROCESSES REQUIRE…
ENERGY
• Squeezing the clothespin, like other biological processes, requires
energy.
• The energy needed is provided by the breakdown of sugars in food to
form ATP (cellular respiration)
• CR requires Oxygen, but after some time cells are unable to provide
the needed amount of oxygen, and lactic acid fermentation occurs.
• When lactic acid builds up, the muscles feel sore and fatigued.
PLEASE BEGIN LAB:
YOU WILL BE CREATING AN
EXPERIMENT FOR THE OTHER LAB
CLASS, AS THEY WILL FOR YOU
BECAUSE THIS LAB TAKES 2 DAYS
TO COMPLETE.
DO NOW
• What is the chemical equation for
Cellular Respiration?
• What organelle is in this picture?
• Do plants perform Cellular
Respiration?
THE BASIC STEPS OF
CELLULAR
RESPIRATION
Step 1: Glycolysis (anerobic)
Step 2: Krebs Cycle (aerobic)
Step 3: Electron Transport Chain
(aerobic)
WHAT IS THE DIFFERENCE?
Anaerobic - Does not
require Oxygen
Aerobic - Does require
Oxygen
GLYCOLYSIS
•
Occurs in the cytoplasm
•
From the Greek words:
• Glykys meaning sweet
• Lysis meaning to Rupture or break
•
ATP = Adenosine Tri-Phosphate
GLYCOLYSIS
1. Phosphate groups from 2 ATP are transferred
to 1 six-carbon molecule (glucose) for energy
producing 2 ADP.
2. That 1 six-carbon molecule (glucose) splits
into two 3-carbon molecules (G3P).
3. Then 2 ADP’s are added and electrons &
𝐻 + combine with 2 𝑁𝐴𝐷 + molecules to form 2
NADP molecules.
4. Finally 2 G3P compounds are converted into
2 molecules of Pyruvate & at the same time,
4 molecules of ATP are produced.
5. The net total being 2 ATP molecules
http://highered.mcgrawhill.com/sites/0072507470/student_view0/chapter
25/animation__how_glycolysis_works.html
WHAT ARE THE INPUTS AND OUTPUTS?
Input
Output
• 1 𝐶6 𝐻12 𝑂6 (𝑔𝑙𝑢𝑐𝑜𝑠𝑒)
From the split of Glucose, it creates…
• 2 ATP
• 1 ADP
Turns into…
• 2 G3P
With help of…
Then from the use of energy we get…
• 2 ADP
• 2 APT
• 1 𝑁𝐴𝐷 +
• NADH (similar to NADP)
It Creates what’s needed for the
Kreb’s Cycle
• 2 Pyruvates
LET’S TRY SOME QUESTIONS…
1. Where does glycolysis occur?
2. What are the inputs of glycolysis?
3. If there are 6 glucose molecules that enter glycolysis, how many total
ATP molecules are produced? What is the net total?
4. What is the goal of glycolysis?
DO NOW
• What is the difference between anaerobic and aerobic?
• Why is there a net output of 2 ATP for 1 glucose in Glycolysis and not 4 ATP?
• Where does Glycolysis occur in the cell?
KREB’S CYCLE
• In the presence of Oxygen,
pyruvate is transported into the
Mitochondrial Matrix, where it is
eventually converted to 𝐶𝑂2 .
• This series of reactions is called the
Kreb’s Cycle or Tricarboxylic Acid
(TCA) Cycle or Citric Acid Cycle.
• This cycle is aerobic.
DO NOW
• How many NADH are made from 4 glucose molecules?
• If 6 FADH2 are produced in the Kreb’s cycle, how many
glucose molecules did you start with?
• How many ATP are made in Kreb’s if you start with 10
pyruvates?