The Cell Membrane

The video tutorial explains the structure and functions of the cell membrane, highlighting its role in separating the cell's internal environment from the external one. It discusses the concept of selective permeability, allowing certain molecules like glucose to enter while expelling waste. The video covers passive transport processes such as diffusion and osmosis, which do not require energy, and contrasts them with active transport, which moves substances against a concentration gradient using energy. Active transport is crucial for processes like mineral uptake in root hair cells.

What is the primary function of the cell membrane?

• To synthesize proteins

• To produce energy for the cell

• To enclose the cell and regulate the movement of substances

• To store genetic information

Which of the following is an example of a molecule that can pass through the cell membrane by diffusion?

• Glucose

• Oxygen

• Proteins

• Starch

What is osmosis?

• The synthesis of proteins

• The process of breaking down glucose

• The movement of particles from low to high concentration

• The movement of water across a selectively permeable membrane

How does active transport differ from passive transport?

• Active transport does not require energy

• Active transport only occurs in plant cells

• Active transport moves substances with the concentration gradient

• Active transport requires energy to move substances against the concentration gradient

Which cell structure is involved in active transport to absorb minerals from the soil?

• Nucleus

• Mitochondria

• Chloroplasts

• Root hair cells