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Cell Membrane Structure and Composition

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Questions and Answers

Which type of substances can pass directly through the membrane?

Nutrients

Ions

Hydrophilic solutes

Lipid-soluble substances (correct)

What is the main function of plasma membranes?

Generate energy through the activity of membrane transport proteins

Control the passage of ions and small organic molecules (correct)

Provide surfaces for the attachment of receptors

Act as sites for the attachment of enzymes only

Which organelles are enclosed by a double-membrane system?

Lysosomes

Peroxisomes

Mitochondria (correct)

Golgi apparatus

What is the function of non-membranous structures in the cytosol?

Support specialized extensions of the cell surface Signup and view all the answers

Which component determines general cell shape and supports specialized extensions of the cell surface?

Filamentous protein networks Signup and view all the answers

What is the total thickness of the plasma membrane?

15 nm Signup and view all the answers

In the electron microscope, how do membranes appear in section?

As two densely stained layers separated by an electron-translucent zone Signup and view all the answers

Where do freeze-fracture cleavage planes usually pass along?

The hydrophobic portion of the bilayer Signup and view all the answers

What do intramembranous particles embedded in the lipid bilayer represent?

Large transmembrane protein molecules or complexes of proteins Signup and view all the answers

Where are intramembranous particles mainly distributed in plasma membranes?

Adhering more to the protoplasmic face (PF) Signup and view all the answers

Cell Membrane Structure and Composition

Choose a study mode

Podcast

Questions and Answers

Which type of substances can pass directly through the membrane?

What is the main function of plasma membranes?

Which organelles are enclosed by a double-membrane system?

What is the function of non-membranous structures in the cytosol?

Which component determines general cell shape and supports specialized extensions of the cell surface?

What is the total thickness of the plasma membrane?

In the electron microscope, how do membranes appear in section?

Where do freeze-fracture cleavage planes usually pass along?

What do intramembranous particles embedded in the lipid bilayer represent?

Where are intramembranous particles mainly distributed in plasma membranes?

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