Cell Membrane Functions and Processes

The video tutorial explains the structure and function of the cell membrane, focusing on the phospholipid bilayer and its components. It covers passive and active transport mechanisms, including diffusion and osmosis, and discusses the effects of hypertonic, hypotonic, and isotonic solutions on cells. The dangers of water toxicity are highlighted with real-life examples. The tutorial also explores factors affecting diffusion and the role of vesicle transport in cells.

What is the primary function of cholesterol in the cell membrane?

• To provide energy for the cell

• To give fluidity and structure to the membrane

• To act as a receptor for hormones

• To transport molecules across the membrane

What is the role of integral proteins in the cell membrane?

• To act as channels for molecules

• To store energy

• To produce hormones

• To provide structural support

Which type of transport requires energy in the form of ATP?

• Osmosis

• Active transport

• Diffusion

• Passive transport

What is the term for the movement of water across a semipermeable membrane?

• Osmosis

• Diffusion

• Active transport

• Facilitated diffusion

What happens to an animal cell in a hypertonic solution?

• It swells and bursts

• It remains unchanged

• It becomes turgid

• It shrinks

Why do plant cells not burst in a hypotonic solution?

• They have more cholesterol

• They have a cell wall

• They have a higher concentration of solutes

• They are impermeable to water

What is a common cause of water intoxication?

• Eating too much salt

• Lack of sleep

• Drinking too much water

• Excessive sweating

What is the treatment for water toxicity?

• Reducing salt intake

• Administering a hypertonic solution of electrolytes

• Taking diuretics

• Drinking more water

What is the process called when a cell engulfs large particles?

• Pinocytosis

• Diffusion

• Exocytosis

• Phagocytosis

Which process involves the cell taking in liquid substances?

• Osmosis

• Exocytosis

• Pinocytosis

• Phagocytosis