Cell Membrane Composition Quiz

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Which of the following is NOT a function of cell membranes?

Defining the boundaries of organelles and separating complex chemical reactions

Serving as attachment surface for cytoskeleton and ECS (correct)

Regulating the movement of material into and out of the cell

Facilitating electrical signaling between cells

What are the main components of cell membranes?

Membrane proteins and cytoplasmic structures

Membrane proteins, membrane lipids, and cytoplasmic structures

Membrane proteins and membrane lipids (correct)

Membrane lipids and cytoplasmic structures

What is the structure of the lipid bilayer in cell membranes?

Multiple layers of lipids

A single layer of lipids

Three layers of lipids

Two layers of lipids (correct)

What is the role of membrane proteins in cell membranes?

Regulating the movement of material into and out of the cell Signup and view all the answers

What is the purpose of cell membrane visualization techniques?

To study the functions and properties of biological membranes Signup and view all the answers

Which of the following is NOT a component of the cell membrane?

Nucleic acids Signup and view all the answers

What percentage of the mass of most animal cell membranes is made up of lipids?

50% Signup and view all the answers

Which type of proteins in the cell membrane mediate functions such as transport and catalysis of reactions?

Transmembrane proteins Signup and view all the answers

What is the main role of the lipid bilayer in the cell membrane?

To regulate the flow of water-soluble molecules Signup and view all the answers

Which model describes cell membranes as fluid, dynamic structures with molecules able to move in the plane of the membrane?

Fluid mosaic model Signup and view all the answers

Which organelles are involved in fatty acid oxidation?

Mitochondria Signup and view all the answers

What is the main function of the cell membrane?

Separating the cellular interior from the exterior Signup and view all the answers

Which process involves the merging of two separate lipid bilayers?

Membrane fusion Signup and view all the answers

What is the purpose of compartmentalization in cells?

To coordinate different reactions in the same pathway Signup and view all the answers

Which organelles are responsible for membrane fission?

Endoplasmic reticulum Signup and view all the answers

Which type of cell membrane contains the highest percentage of lipids?

Liver cell (Mouse) Signup and view all the answers

Which type of cell membrane contains the highest percentage of proteins?

Liver cell (Rat) Signup and view all the answers

Which type of cell membrane contains the highest percentage of carbohydrates?

Erythrocytes (Human) Signup and view all the answers

What is the main difference between bacterial plasma membranes and eukaryotic cell membranes?

Bacterial plasma membranes have an overlying cell wall, while eukaryotic cell membranes do not. Signup and view all the answers

What is the most favorable structure for lipid molecules in an aqueous environment?

Bimolecular sheets (bilayers) Signup and view all the answers

Which microscopy technique provides views of surfaces inside the cell?

Freeze-fracture electron microscopy Signup and view all the answers

What is the main purpose of the freeze-fracture technique?

To study the cell membrane Signup and view all the answers

Which type of electron microscopy is used to visualize the cells' cytoplasm rich in cytokeratin?

Transmission electron microscopy (TEM) Signup and view all the answers

What are the major components of a phospholipid molecule in the cell membrane?

Polar head group and two hydrophobic hydrocarbon tails Signup and view all the answers

Which of the following is true about the bilayer in the cell membrane?

The bilayer is asymmetric with unequal distribution of phospholipids Signup and view all the answers

Which phospholipid carries a net negative charge in the plasma membrane?

Phosphatidylserine Signup and view all the answers

Which of the following is NOT a major phospholipid found in mammalian plasma membranes?

Sphingomyelin Signup and view all the answers

Where is the outer membrane layer located?

Extracellular space Signup and view all the answers

Which of the following is NOT a lipid found in the bilayer of the cell membrane?

Phosphatidylcholine Signup and view all the answers

Who authored the text?

Clara Camargo, DVM Signup and view all the answers