Exploring Cell Membrane and Cell Wall Functions

The video tutorial explains the structure and function of the cell membrane and cell wall. It describes how the cell membrane is selectively permeable, allowing only certain substances to enter or exit the cell. The cell wall, found in plant cells, provides additional protection and structure. The video also covers the processes of diffusion and osmosis, illustrating how substances move across the cell membrane. Through an experiment with raisins, the concepts of hypotonic and hypertonic solutions are demonstrated, showing how osmosis affects cell size and shape. The tutorial concludes with a recap of the key concepts discussed.

What is the primary function of the cell membrane?

• To provide structural support

• To control the entry and exit of substances

• To store genetic information

• To produce energy

Tags

NGSS.MS-LS1-2

What is the cell membrane made of?

• Carbohydrates and proteins

• Lipids and proteins

• Nucleic acids and lipids

• Cellulose and proteins

Tags

NGSS.MS-LS1-2

What additional protective layer is found in plant cells?

• Cell membrane

• Nucleus

• Chloroplast

• Cell wall

What is the cell wall made of?

• Cellulose

• Lipids

• Starch

• Proteins

What is diffusion?

• Movement of water from low to high concentration

• Movement of substances from low to high solute concentration

• Movement of substances from high to low solute concentration

• Movement of water from high to low concentration

Which substances move across the cell membrane by diffusion?

• Carbon dioxide and oxygen

• Water and glucose

• Starch and cellulose

• Proteins and lipids

What is osmosis?

• Movement of water from high to low concentration

• Movement of solutes from high to low concentration

• Movement of water from low to high concentration

• Movement of solutes from low to high concentration

Tags

NGSS.MS-LS1-2

What happens to raisins when placed in water?

• They swell up

• They shrink

• They remain the same

• They dissolve

What is a hypotonic solution?

• A solution with lower water concentration than the cell

• A solution with higher water concentration than the cell

• A solution with lower solute concentration than the cell

• A solution with higher solute concentration than the cell

What is plasmolysis?

• Swelling of the cell

• Movement of solutes out of the cell

• Shrinking of the cytoplasm away from the cell wall

• Movement of water into the cell

Tags

NGSS.MS-LS1-2