Membranes and Membrane Transport Quiz

What are the main components of the cell membrane structure?

• phospholipids, proteins, cholesterol, and carbohydrates

• lipids, nucleic acids, and amino acids

• water, salt, and minerals

• proteins, carbohydrates, and DNA

Describe the fluid mosaic model of the cell membrane.

• The fluid mosaic model describes the cell membrane as a rigid structure with no embedded proteins or carbohydrates.

• The fluid mosaic model describes the cell membrane as a dynamic structure composed of a lipid bilayer with embedded proteins, carbohydrates, and cholesterol.

• The fluid mosaic model describes the cell membrane as a single layer of lipids with no embedded proteins or carbohydrates.

• The fluid mosaic model describes the cell membrane as a static structure composed of only proteins and cholesterol.

Explain the process of active transport and provide an example.

• Active transport is the movement of molecules from an area of high concentration to an area of low concentration

• Passive transport is the movement of molecules across a membrane using energy

• An example of active transport is the diffusion of water molecules across a semipermeable membrane

• An example of active transport is the sodium-potassium pump, which actively transports sodium ions out of the cell and potassium ions into the cell against their concentration gradients.

Compare and contrast primary active transport and secondary active transport.

• Primary active transport uses energy from the electrochemical gradient, while secondary active transport uses direct energy.

• Primary active transport uses energy from the electrochemical gradient, while secondary active transport uses energy from the concentration gradient.

• Primary active transport uses direct energy, while secondary active transport uses energy from the electrochemical gradient.

• Primary active transport does not require energy, while secondary active transport requires direct energy.

Define osmosis and explain how it affects cell function.

• Osmosis leads to increased cell division

• Osmosis causes cells to shrink and die

• Osmosis has no effect on cell function

• Osmosis affects cell function by regulating the water content inside the cell and maintaining the cell's internal environment.

What is one similarity and one difference between simple diffusion and facilitated diffusion?

• Facilitated diffusion requires a membrane protein but simple diffusion does not.

• Facilitated diffusion requires ATP, but simple diffusion does not.

• Both simple and facilitated diffusion move molecules down their concentration gradient.

• Facilitated diffusion requires a membrane protein but simple diffusion does not

Explain the role of membrane proteins in cell signaling and recognition.

• Membrane proteins are only involved in structural support

• Membrane proteins have no role in cell signaling or recognition

• Membrane proteins store energy for the cell

• Membrane proteins act as receptors for signaling molecules and facilitate cell-cell communication.

Explain the difference between simple diffusion and facilitated diffusion.

• Simple diffusion requires energy, while facilitated diffusion does not require energy.

• Simple diffusion involves the movement of molecules across a membrane with the help of transport proteins, while facilitated diffusion does not involve transport proteins.

• Simple diffusion is a passive process, while facilitated diffusion is an active process.

• Simple diffusion is a faster process compared to facilitated diffusion.

What is the role of cholesterol in the cell membrane?

• Cholesterol provides energy for the cell.

• Cholesterol helps to maintain the fluidity and stability of the cell membrane.

• Cholesterol is involved in cell signaling and recognition.

• Cholesterol is responsible for the transport of ions across the cell membrane.

Describe the process of endocytosis and its significance in cells.

• Endocytosis is the process of releasing substances from the cell to the external environment.

• Endocytosis is the process of engulfing and internalizing substances into the cell through the formation of vesicles.

• Endocytosis is a passive process that does not require energy.

• Endocytosis is only significant in plant cells, not in animal cells.