Cellular Respiration Flashcards
What is cellular respiration?
The process by which cells convert glucose and oxygen into energy, carbon dioxide, and water.
True or False: Cellular respiration occurs only in the presence of oxygen.
False
What is the main purpose of glycolysis?
To break down glucose into pyruvate, producing a small amount of ATP and NADH.
What is produced during the krebs cycle?
ATP, NADH, FADH2, and carbon dioxide.
What is the role of oxygen in cellular respiration?
To act as the final electron acceptor in the electron transport chain.
True or False: Anaerobic respiration occurs without oxygen.
True
What is lactic acid fermentation?
A type of anaerobic respiration that occurs in muscle cells, producing lactic acid and ATP.
Fill in the blank: The electron transport chain occurs in the ______ of the mitochondria.
inner membrane
What is the net gain of ATP from glycolysis?
2 ATP
Multiple choice: Which molecule is primarily used by cells for energy? A) DNA B) ATP C) RNA D) Glucose
B) ATP
What is oxidative phosphorylation?
The process of generating ATP using the energy from the electron transport chain and chemiosmosis.
True or False: The krebs cycle occurs in the cytoplasm.
False
What are the two types of fermentation?
Lactic acid fermentation and alcoholic fermentation.
Fill in the blank: The main electron carriers produced during the citric acid cycle are ______ and FADH2.
NADH
What is the role of ATP synthase in cellular respiration?
To synthesize ATP from ADP and inorganic phosphate using the proton gradient.
Multiple choice: Which process generates the most ATP during cellular respiration? A) Glycolysis B) Citric Acid Cycle C) Electron Transport Chain D) Fermentation
C) Electron Transport Chain
What is the total theoretical yield of ATP from one molecule of glucose during cellular respiration?
Up to 38 ATP
cellular respiration
high energy reactants -> low energy products
C⁶H¹²O⁶ + O² -> CO² + H²O
- Glycolysis
- Link Rxn
- Krebs Cycle
- Electron Transfer
glycolysis
cytoplasmic (even prokaryotes can perform)
anaerobic (no oxygen consumption)
in cytoplasm, glucose is broken down into 2 puruvates.
invest: 2 ATP +1 Glucose
outcome: 4 ATP + 2 NADH + 2 pyruvate
Link reaction
pyruvate is split and added to coemzyme A to enter Krebs
2 pyruvates (3- carbon) -> 2 Acetyl-CoA
(coenzyme A: babysitter ensures carbon reacehs next step)
Krebs Cycle
in mitochondrial matrix
removes H-atoms from carb source (pyruvate)
forms CO², NADH, FADH², ATP
electron transport
inner membranes of mitochondria
90% of ATP generation from respiration
protons cross mitochondrial membranes, producing ATP
oxygen accepts electrons -> H²O
oxidative phosphorylation
O² binds to hydrogen’s electrons -> H²O
aerobic
anaerobic feedback ihibition
abundance of NADH from glycolysis, link rxn, krebs inhibits glycolysis
slows down glycloysis in absence of oxygen
consume pyruvate & NADH -> glycolysis continues
