Class notes
Biol 113 Cellular Respiration Notes
- Course
- BIO113
- Institution
- State University Of New York - Binghamton
This is a comprehensive and detailed note on cellular respiration with practice questions.
[Show more]
Content preview
Lec 23: Cellular RespirationBig Picture of Cellular Respiration
A series of enzyme catalyzed reactions that break down glucose to release energy
→ That energy is used in the electron transport chain to make
ATP
Catabolic reactions — breaking down glucose — release energy
→ Anabolic reaction — using energy released by catabolic reactions to build
ATP
→
Ultimate goal of cellular respiration is to make ATP
All cells use ATP to power the work that they do. Remember that the hydrolysis
of ATP releases energy. That energy is used by the cell to do everything it needs to do to keep it alive
● But cells can’t store ATP, so they have to make it constantly
There are high energy electrons that get released through the breakdown of glucose that get used to
power an enzyme called ATP synthase to make ATP.
Where is ATP synthase located?
● ATP synthase is coupled with a membrane channel that
is embedded in the inner membrane of the mitochondria
● Blue areas = intermembrane space
How does ATP synthase work?
● There is a hydrogen ion gradient that is built up inside the intermembrane space. The high
concentration of H+ causes H+ to flow through the membrane channel and that spins ATP
synthase, It works in the same way flowing water spins a water mill
○ Hydrogen ion gradient ⇒ Higher concentration of hydrogen ions in the intermembrane
space than in the matrix, and these hydrogen atoms (because flowing down
concentration gradient) flow through the membrane channel
○ Causing ATP synthase to spin
● H+ ions spinning ATP synthase provides the power needed to synthesize ATP:
○ ADP + Pi → ATP
, 1. As the concentration of ATP increases, ATP synthase will
a. Speed up
b. Slow down
c. Maintain the same rate
2. If the hydrogen ion gradient in the intermembrane space increases, ATP synthase will
a. Speed up
b. Slow down
c. Maintain the same rate
The hydrogen gradient powers ATP synthase…so what builds and maintains the H+ gradient?
● The H+ gradient is built up by a series of molecules called the electron transport chain that are
also embedded in the inner membrane. These molecules drive H+ from the matrix to the
intermembrane system
Practice:
1. True or False? The molecules of the electron transport chain must use energy to drive H+ to the
intermembrane space and maintain the high concentration there.
a. You are maintaining a high concentration, so they must use energy to make this
happen
2. What kind of transport are the molecules of the electron transport chain using to create and
maintain the H+ gradient?
a. Active transport - move through the cell membrane against their concentration gradient
(from low to high) through a protein channel and uses energy
The molecules of the electron transport chain get their energy from the breakdown of glucose
→ “Energy”
= talking
about high
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller anyiamgeorge19. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79373 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now