Exploring Cell Membrane Functions and Transport Mechanisms

The video lecture covers the cell membrane's structure and function, emphasizing its role in maintaining homeostasis by controlling the movement of substances in and out of the cell. It explains the cell membrane's composition, including the phospholipid bilayer and embedded proteins, and introduces the fluid mosaic model. The lecture also details cell transport mechanisms, distinguishing between passive transport (diffusion, osmosis, facilitated diffusion) and active transport (endocytosis, exocytosis), highlighting the energy requirements and processes involved in each type.

What is the primary function of the cell membrane?

• To store genetic information

• To produce proteins

• To control what enters and exits the cell

• To provide energy to the cell

Which part of the phospholipid is hydrophilic?

• The entire molecule

• None of the above

• The head

• The tail

What model explains the flexible nature of the cell membrane?

• Dynamic Equilibrium Model

• Rigid Structure Model

• Fluid Mosaic Model

• Solid State Model

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

• Semi-permeable

• Permeable

• Impermeable

• Non-permeable

Which type of cell transport does not require energy?

• Passive transport

• Active transport

• Exocytosis

• Endocytosis

What is the process called when water diffuses across a semi-permeable membrane?

• Active transport

• Osmosis

• Diffusion

• Facilitated diffusion

In which type of solution does a cell remain the same size due to equal water movement in and out?

• Hypotonic

• Hypertonic

• Isotonic

• None of the above

What type of passive transport involves molecules moving through channel proteins?

• Simple diffusion

• Osmosis

• Facilitated diffusion

• Active transport

What is the process called when a cell engulfs large particles by wrapping its membrane around them?

• Facilitated diffusion

• Osmosis

• Endocytosis

• Exocytosis

Which organelle plays a major role in exocytosis?

• Mitochondria

• Nucleus

• Ribosome

• Golgi body