Plasma Membrane Quiz

What is the structure of the plasma membrane?

• Phospholipid bilayer with embedded proteins and cholesterol molecules

• Double layer of cholesterol with embedded proteins

• Single layer of phospholipids

• Protein bilayer with embedded cholesterol molecules

Explain the fluid mosaic model of the plasma membrane.

• The fluid mosaic model of the plasma membrane describes the structure of the cell membrane as a fluid-like phospholipid bilayer with embedded proteins.

• The fluid mosaic model of the plasma membrane suggests that proteins are not embedded in the phospholipid bilayer.

• The fluid mosaic model of the plasma membrane describes the structure of the cell membrane as a solid layer with no movement.

• The fluid mosaic model of the plasma membrane is a rigid structure made up of only phospholipids.

What is the main component of the plasma membrane?

• nucleic acids

• carbohydrates

• phospholipids

• proteins

Describe the phospholipid bilayer in the plasma membrane.

• The phospholipid bilayer is a single layer of phospholipid molecules that forms the basic structure of the plasma membrane.

• The phospholipid bilayer is made up of protein molecules that forms the basic structure of the plasma membrane.

• The phospholipid bilayer is a double layer of phospholipid molecules that forms the basic structure of the plasma membrane.

• The phospholipid bilayer is a rigid layer of phospholipid molecules that forms the basic structure of the plasma membrane.

What are membrane proteins and their functions in the plasma membrane?

• Membrane proteins are proteins that are only found in prokaryotic cells.

• Membrane proteins are proteins that are not involved in any cellular processes.

• Membrane proteins are proteins embedded in or associated with the plasma membrane. They have various functions such as transporting molecules, acting as receptors, and providing structural support.

• Membrane proteins are proteins found only in the cytoplasm.

How does the plasma membrane maintain its fluidity?

• Presence of saturated fatty acid tails, cholesterol, and lateral movement of phospholipids

• Presence of unsaturated fatty acid tails, absence of cholesterol, and lateral movement of phospholipids

• Presence of saturated fatty acid tails, absence of cholesterol, and limited movement of phospholipids

• Presence of unsaturated fatty acid tails, cholesterol, and lateral movement of phospholipids

What are integral proteins and peripheral proteins in the plasma membrane?

• Integral proteins are embedded within the plasma membrane and span across its entire width, while peripheral proteins are attached to the surface of the membrane but do not span across it.

• Peripheral proteins are embedded within the plasma membrane and span across its entire width.

• Integral proteins are only found in the cytoplasm and do not interact with the plasma membrane.

• Integral proteins are attached to the surface of the membrane but do not span across it.

Explain the role of cholesterol in the plasma membrane.

• Cholesterol acts as a barrier, preventing the movement of molecules across the plasma membrane.

• Cholesterol maintains membrane fluidity and stability, regulates phospholipid arrangement, and forms lipid rafts.

• Cholesterol helps in the synthesis of proteins in the plasma membrane.

• Cholesterol is responsible for transporting nutrients across the plasma membrane.

What is the significance of glycoproteins and glycolipids in the plasma membrane?

• They are involved in cell recognition and signaling.

• They play a role in energy production and metabolism in the cell.

• They are involved in the transport of ions and molecules across the plasma membrane.

• They are responsible for maintaining the structural integrity of the plasma membrane.

How does the plasma membrane regulate the movement of substances?

• Selective permeability, transport proteins, and active transport.

• Active transport, diffusion, and osmosis.

• Endocytosis, exocytosis, and diffusion.

• Facilitated diffusion, osmosis, and passive transport.