La membrana celular

The video tutorial explains the cell membrane's vital roles, including containing cell elements and regulating substance entry and exit. It highlights the membrane's selective permeability, allowing specific molecules like glucose to pass while removing waste. The tutorial covers passive transport methods, diffusion and osmosis, where substances move without energy. It also discusses active transport, requiring energy to move substances against a concentration gradient, facilitated by carrier proteins. The importance of the membrane in cell functions and life is emphasized.

What is the primary role of the cell membrane?

• To synthesize proteins

• To enclose cell components and regulate substance entry and exit

• To store genetic information

• To produce energy for the cell

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

• Proteins

• Oxygen

• Glucose

• Starch

What is osmosis?

• The movement of particles from low to high concentration

• The diffusion of water through a selectively permeable membrane

• The active transport of ions

• The synthesis of ATP

What distinguishes active transport from passive transport?

• Active transport only occurs in plant cells

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

• Active transport moves substances along the concentration gradient

• Active transport does not require energy

How do root hair cells absorb minerals from the soil?

• By diffusion

• By osmosis

• By active transport

• By endocytosis