cellular respiration 8.1 overview. what is respiration? three definitions inspiration-expiration ...
TRANSCRIPT
Cellular Respiration
8.1 Overview
What is respiration? Three definitions
Inspiration-expiration Exchange of O2 for CO2 in lungs Consumption of O2 and production of CO2 in tissues
Involves glucose Exergonic Produces ATP Redox reaction
What are NAD+ and FAD? Enzymes use these
during oxidation respiration
FAD sometimes used instead
What are the phases of respiration? Glycolysis Krebs cycle (citric acid cycle) Electron transport chain
Cellular Respiration
8.2 Glycolysis
What is glycolysis? Literally means _________ Happens outside mitochondrion Goal is to generate pyruvate Two stages
Energy investment Phosphoryation using 2 ATP
Energy harvest See next slide…
What happens during energy harvest? Substrate level phosphorylization
To make ATP Pyruvate also formed Overall reaction:
Cellular Respiration
8.3 Krebs Cycle
What is the Krebs Cycle? AKA the citric acid
cycle Happens in
mitochondrial matrix
Goal: generate ATP, FADH2 and NADH from pyruvate
Series of redox reactions A type of
metabolic pathway
What are the steps? Prepatory step
Convert pyruvate to acetyle co-A
What happens next? Citric Acid Cycle
Key: it’s a cycle– it repeats!
What are the products of the Krebs cycle?
Cellular Respiration
8.4 Electron transport chain
What is the electron transport chain (ETC)? Series of redox
reactions to make ______
Happens in cristae Oxidative
phophorylation Consumes oxygen Produces ATP +
H2O
What are the steps of the ETC? Chemiosmosis involved Passing of
Electrons H+
What is energy yield of oxidative respiration? After all three stages
Cellular Respiration
8.5 Fermentation
What happens if no oxygen is present? Anaerobic respiration
Inorganic molecule is final electron acceptor Some bacteria use
Fermentation Organic molecule is final electron acceptor
Different types Alcoholic fermentation Lactic acid fermentation
What happens in fermentation? Glycolysis Then
pyruvate reduction
NAD regeneration
What are the pros and cons of fermentation? Pros
Oxygen not necessary Cons
Very low ATP production
What is the metabolic pool? Compounds oxidized
for entry into biosynthesis reactions
Catabolism Deamination (in
liver) Anabolism