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Mitochondria Structure: Inner and Outer Membranes

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Mitochondria Structure: Inner and Outer Membranes

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Questions and Answers

What is the main function of the inner mitochondrial membrane?

Increase the area of the outer membrane

Contain proteins called porins

Maintain the proton gradient for oxidative phosphorylation (correct)

Facilitate the diffusion of small molecules

What is the role of the outer mitochondrial membrane?

Facilitate the diffusion of small molecules (correct)

Maintain the proton gradient for oxidative phosphorylation

Increase the area of the inner membrane

Contain proteins called porins

What determines the biochemical function of the two membranes in mitochondria?

Similar appearance

Physico-chemical properties (correct)

Composition of the intermembrane space

Presence of cristae in the matrix

What is the purpose of the invaginations called mitochondrial cristae?

<p>Increase the area of the inner membrane</p> Signup and view all the answers

What is the composition of the intermembrane space in mitochondria similar to?

<p>Cytosol</p> Signup and view all the answers

Study Notes

Mitochondrial Membranes

The inner mitochondrial membrane is the site where cellular respiration takes place, specifically the electron transport chain and ATP synthesis.
The outer mitochondrial membrane is semi-permeable, allowing certain substances to pass through while keeping others out, and is involved in the regulation of mitochondrial dynamics.

Determinants of Biochemical Function

The biochemical function of the two membranes in mitochondria is determined by their unique composition of proteins and lipids.

Mitochondrial Cristae

The invaginations called mitochondrial cristae increase the surface area of the inner mitochondrial membrane, allowing for a greater number of electron transport chains and therefore increased ATP production.

Intermembrane Space

The composition of the intermembrane space in mitochondria is similar to that of the cytosol, with a high concentration of ions and metabolites.

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Description

Test your knowledge of mitochondria structure with this quiz about the composition and characteristics of the inner and outer membranes. Learn about the phospholipid bilayer structure and the biochemical functions associated with each membrane.