Structure of Plasma Membrane

What is the main component of the plasma membrane?

• Phospholipids

• Nucleic Acids

• Carbohydrates

• Proteins

Explain the structure of a phospholipid molecule and how it contributes to the plasma membrane.

• The structure of a phospholipid molecule contributes to the plasma membrane by forming a trilayer

• Phospholipids have a linear structure that allows them to move freely within the membrane

• Phospholipids contribute to the plasma membrane by acting as enzymes

• The structure of a phospholipid molecule contributes to the plasma membrane by forming a bilayer that acts as a barrier, regulating the passage of substances in and out of the cell.

Describe the role of membrane proteins in the plasma membrane.

• Membrane proteins in the plasma membrane are only present in plant cells.

• Membrane proteins in the plasma membrane play crucial roles in various cellular functions such as transport of molecules, cell signaling, cell adhesion, and structural support.

• Membrane proteins in the plasma membrane have no impact on cellular functions.

• Membrane proteins in the plasma membrane are only involved in energy production.

According to the fluid mosaic model, how is the plasma membrane organized?

• Monolayer with no proteins

• Proteins forming a separate layer on top of the phospholipids

• Proteins floating freely in the cytoplasm

• Phospholipid bilayer with embedded proteins

What does selective permeability mean in the context of the plasma membrane?

• Allows all substances to pass through without any restrictions.

• Allows substances to pass through randomly without any control.

• Allows only certain substances to pass through while blocking others.

• Blocks all substances from passing through.

Discuss the significance of cholesterol in the plasma membrane.

• Cholesterol in the plasma membrane has no impact on fluidity or stability

• Cholesterol does not play a role in regulating lipid and protein arrangement in the plasma membrane

• Cholesterol is significant in the plasma membrane for maintaining fluidity, stability, and permeability, as well as regulating lipid and protein arrangement.

• Cholesterol primarily functions as a structural component in the plasma membrane

Explain how the plasma membrane maintains homeostasis within the cell.

• The plasma membrane maintains homeostasis by absorbing excess nutrients

• The plasma membrane maintains homeostasis within the cell by selectively controlling the movement of substances in and out of the cell.

• The plasma membrane maintains homeostasis by preventing any substance from entering the cell

• The plasma membrane maintains homeostasis by constantly changing its structure

Tags

NGSS.HS-LS1-3

What are some factors that can affect the fluidity of the plasma membrane?

• pH level, cell size, cytoskeleton composition

• Temperature, lipid composition, cholesterol content, integral membrane proteins

How do cells regulate the movement of substances across the plasma membrane?

• Via teleportation and time travel

• By using telekinesis and mind control

• Through osmosis and photosynthesis

• Through processes like passive diffusion, facilitated diffusion, active transport, endocytosis, and exocytosis.