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Molecular Biology of the Cell 2: Chapter 10 Quiz - Membrane Structure

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Molecular Biology of the Cell 2: Chapter 10 Quiz - Membrane Structure

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Questions and Answers

What is the main function of the plasma membrane?

To maintain the essential differences between the cytosol and the extracellular environment (correct)

To synthesize proteins for the cell

To produce energy for the cell

To store genetic material

What provides the basic fluid structure of biological membranes?

Lipid bilayer (correct)

Mitochondria

Ribosomes

Cytoskeleton

What do most membrane proteins do?

Span the lipid bilayer and mediate various functions of the membrane (correct)

Store energy in the form of ATP

Produce enzymes for cellular reactions

Facilitate cell division

What is the approximate thickness of the lipid bilayer in biological membranes?

5 nm Signup and view all the answers

Which organelles maintain characteristic differences within eukaryotic cells?

Nucleus, endoplasmic reticulum, Golgi apparatus, and mitochondria Signup and view all the answers

What is the role of membrane proteins in biological membranes?

Mediate various functions of the membrane Signup and view all the answers

What is the primary factor responsible for the bilayer structure of the lipid molecules in cell membranes?

The special properties of the lipid molecules Signup and view all the answers

Which of the following represents a common characteristic of all lipid molecules in cell membranes?

Presence of hydrophilic and hydrophobic ends Signup and view all the answers

Which of the following is a common feature of phospholipids in most animal cell membranes?

Presence of a phosphate group and two hydrophobic hydrocarbon tails Signup and view all the answers

How do differences in the length and saturation of the fatty acid tails influence phospholipid molecules in cell membranes?

They affect the fluidity of the membrane Signup and view all the answers

What is the main difference between phosphoglycerides and sphingolipids?

Phosphoglycerides contain a glycerol backbone while sphingolipids contain sphingosine Signup and view all the answers

What makes phosphatidylserine a special phosphoglyceride?

It has a negatively charged head group Signup and view all the answers

What is attached to the terminal hydroxyl group of sphingomyelin?

A phosphocholine group Signup and view all the answers

What is the primary role of transmembrane proteins in the plasma membrane?

Detection and transduction of chemical signals in the cell’s environment Signup and view all the answers

What constitutes about 50% of the mass of most animal cell membranes?

Lipid molecules Signup and view all the answers

What is a common characteristic of lipid molecules in cell membranes?

Amphiphilic nature with hydrophilic and hydrophobic ends Signup and view all the answers