Flashcards in Cellular Respiration Deck (36)
What is cellular metabolism
the sum of all chemical reactions in a cell
Point of cellular respiration?
Convert energy stored in glucose to ATP
Order of the three phases?
Glycolysis -> Citric acid cycle -> oxidative phosphorylation
Where does Glycolysis occur
In the cytoplasm (anaerobic)
What is the point of Glycolysis
Begin oxidation of Glucose
First reaction of Glycolysis?
Hexokinase (addition of inorganic Pi from ATP makes glucose more reactive)
Third reaction of Glycolysis?
Phosphofructokinase (another ATP required to phosphorylate the sugar)
Meaning of phosphorylate?
Introduce a phosphate group into a molecule
What happens after phosphofructokinase?
Glucose is split into 2x3C (G3P)
Two phases of Glycolysis?
Energy investment (Hexokinase & phosphofructokinase) and energy payoff
First step of energy payoff phase?
NADH is produced from NAD+ (organic C has been partially oxidized)
The first reactions of the energy payoff phase occur __ times each
What is substrate level phosphorylation?
When energy for ATP synthesis comes from the dephosphorylating of a substrate (losing P)
How many ATP does Glycolysis provide per Glucose?
Two (2 used, 4 produced)
How many NADH are produced per Glucose in Glycolysis
What is the product of Glycolysis?
What is the site of cellular respiration?
How many times does Glycolysis happen per glucose?
Pyruvic acid is _______ into Acetyle CoA by ________ when pyruvate enters the ___________ because otherwise it is ____________.
2. Coenzyme A
How many carbons in acetyl CoA
Point of Krebs/Citric acid cycle?
Complete oxidation of glucose (CH -> CO2)
Where does the Krebs cycle occur?
In the matrix
What is FADH2?
Another type of electron carrier (lower energy electrons than NADH)
How many times does the Krebs cycle turn per Glucose?
How many ATC are produced by the Krebs cycle?
What is the strongest oxidizing agent?
What happens at the end of the electron transport chain?
Oxygen is reduced (O2 -> H2O)
What is Chemiosmosis
Synthesis of ATP using an H+ gradient
Where does the energy for chemiosmosis come from (difference btw Photosynthesis and Cell Resp)
In photosynthesis: energy for H+ gradient comes from light (Photophosphorylation)
In Cell resp: energy for H+ gradient comes from redox reactions: glucose (oxidative phosphorylation)