Osmosis and Cell Membrane Functions

The video tutorial explains the structure and function of the cell membrane, highlighting the processes of diffusion and active transport. Diffusion is a passive transport method that does not require energy, while active transport requires energy in the form of ATP to move molecules across the cell membrane. The video also introduces osmosis, the movement of water through a semi-permeable membrane from an area of higher water concentration to lower concentration, until equilibrium is reached.

What is the primary function of the cell membrane?

• To store genetic information

• To produce proteins

• To control the movement of substances in and out of the cell

• To provide energy to the cell

Which process requires energy to move molecules across the cell membrane?

• Passive transport

• Osmosis

• Active transport

• Diffusion

What molecule provides the energy for active transport?

• RNA

• ATP

• DNA

• Glucose

What is the role of protein molecules in active transport?

• They break down molecules

• They store genetic information

• They act as channels to facilitate the movement of molecules

• They provide energy for the process

How does passive transport differ from active transport?

• Passive transport uses protein carriers, active transport does not

• Passive transport moves molecules against the concentration gradient

• Passive transport requires energy, active transport does not

• Passive transport does not require energy, active transport does

Which of the following is an example of passive transport?

• Exocytosis

• Endocytosis

• Active transport

• Diffusion

What is osmosis?

• Movement of water from low to high concentration

• Movement of water from high to low concentration through a semi-permeable membrane

• Movement of solutes from high to low concentration

• Movement of solutes from low to high concentration

In osmosis, what type of membrane is involved?

• Permeable membrane

• Impermeable membrane

• Non-permeable membrane

• Semi-permeable membrane

What happens to water molecules during osmosis?

• They move randomly without any concentration gradient

• They remain stationary

• They move from a region of high solute concentration to low solute concentration

• They move from a region of low solute concentration to high solute concentration

What is the result of osmosis in a solution with different concentrations on either side of a membrane?

• The concentration of solutes becomes equal on both sides

• The concentration of water becomes equal on both sides

• The concentration of water decreases on one side

• The concentration of solutes increases on one side