Cell Membrane Structure and Function

The video explains how cells maintain homeostasis using the cell membrane through diffusion and osmosis. It covers the structure and function of the cell membrane, highlighting its semi-permeable nature. The video details diffusion, including simple and facilitated diffusion, and explains osmosis as the movement of water across membranes. It also discusses how cells react in different solutions, such as isotonic, hypertonic, and hypotonic environments, to maintain equilibrium.

What is the primary structural component of the cell membrane?

• Nucleic acids

• Phospholipids

• Carbohydrates

• Proteins

Which part of the phospholipid is attracted to water?

• Hydrophobic tail

• Non-polar tail

• Hydrophilic head

• Lipid tail

What term describes the cell membrane's ability to allow some substances to pass while blocking others?

• Non-permeable

• Permeable

• Impermeable

• Semi-permeable

In diffusion, molecules move from an area of _______ concentration to an area of _______ concentration.

• Low, high

• Equal, unequal

• Unequal, equal

• High, low

What is the main difference between simple diffusion and facilitated diffusion?

• Energy requirement

• Presence of a transport protein

• Direction of molecule movement

• Type of molecules involved

Osmosis specifically involves the movement of which type of molecule?

• Protein

• Glucose

• Salt

• Water

During osmosis, water moves towards the area with:

• No solute concentration

• Lower solute concentration

• Equal solute concentration

• Higher solute concentration

What happens to a cell in a hypertonic solution?

• It remains the same size

• It shrinks

• It bursts

• It swells

In which type of solution does a cell maintain its size due to equal water movement in and out?

• Hypertonic

• Hypotonic

• Isotonic

• Supersonic

If a cell is placed in a hypotonic solution, what is the expected outcome?

• The cell will dissolve

• The cell will shrink

• The cell will swell

• The cell will remain unchanged