Cell Membrane Functions and Transport Mechanisms in Biology

The video explores the structure and function of cells, focusing on the cell membrane's role in maintaining homeostasis. It explains passive transport, including simple and facilitated diffusion, and active transport, powered by ATP. The video also covers endocytosis and exocytosis, processes that allow cells to intake and expel large molecules.

What is the primary function of the cell membrane in maintaining homeostasis?

• To produce proteins

• To control what enters and exits the cell

• To store genetic material

• To provide energy to the cell

What is the basic structure of the cell membrane?

• A single layer of proteins

• A double layer of nucleic acids

• A phospholipid bilayer

• A layer of carbohydrates

Which type of molecules can pass through the cell membrane via simple diffusion?

• Ions

• Proteins

• Small non-polar molecules

• Large polar molecules

What role do transport proteins play in facilitated diffusion?

• They break down molecules

• They store molecules

• They act as channels or carriers for molecules

• They provide energy for transport

Which of the following is an example of facilitated diffusion?

• Oxygen passing through the membrane

• Glucose entering the cell with a transport protein

• Water moving through aquaporins

• Both B and C

What is required for active transport to occur?

• A concentration gradient

• ATP energy

• Facilitated diffusion

• Simple diffusion

Which process involves the cell membrane fusing with large molecules to bring them inside?

• Simple diffusion

• Facilitated diffusion

• Exocytosis

• Endocytosis

What is the main difference between endocytosis and exocytosis?

• Both involve exiting the cell

• Endocytosis involves entering the cell, while exocytosis involves exiting

• Both involve entering the cell

• Endocytosis involves exiting the cell, while exocytosis involves entering

Which type of endocytosis involves the cell being selective about what it takes in?

• Pinocytosis

• Phagocytosis

• Simple diffusion

• Receptor-mediated endocytosis

Why is exocytosis important for plant cells?

• It removes waste products

• It helps in photosynthesis

• It stores energy

• It is essential for building cell walls