4th: br-Cell Membrane and Cell Transport

What is the role of proteins in the cell membrane?

• They assist in transport, act as receptors, and provide structural support.

• They store genetic information.

• They catalyze chemical reactions within the cell.

• They provide energy for cellular processes.

What happens during endocytosis?

• The cell engulfs material from the outside environment.

• The cell releases waste products into the environment.

• The cell divides into two daughter cells.

• The cell shrinks in size due to dehydration.

What role do cholesterol molecules play in the cell membrane?

• They help to stabilize the membrane's fluidity.

• They increase the permeability of the membrane.

• They act as a barrier to prevent substances from entering the cell.

• They provide energy for cellular processes.

What are the channels and pumps in the cell membrane made of?

• Carbohydrates

• Lipids

• Proteins

• Nucleic Acids

What is the phospholipid bilayer?

• A double layer of phospholipids that makes up the cell membrane.

• A single layer of proteins that surrounds the cell.

• A type of carbohydrate layer that provides energy to the cell.

• A rigid structure that protects the cell from external damage.

What happens to a cell when the concentration of red molecules outside is higher than inside, and they cannot penetrate the cell?

• Water will leave the cell, and the cell will shrink.

• The cell will swell and possibly burst.

• The cell will remain the same size.

• The cell will absorb more red molecules.

What is osmosis?

• The diffusion/movement of water.

• The process of photosynthesis in plants.

• The absorption of nutrients in the intestines.

• The circulation of blood in the body.

What is the primary function of the cell membrane?

• To provide energy to the cell.

• To protect the cell and regulate what enters and exits.

• To store genetic information.

• To facilitate cell division.

What is the significance of the fluid mosaic model?

• It describes the cell membrane as a dynamic and flexible structure with various components.

• It explains the process of cellular respiration in mitochondria.

• It outlines the steps of protein synthesis in ribosomes.

• It illustrates the structure of DNA and its replication process.

What structures in the cell membrane identify and communicate with the extracellular environment?

• Phospholipid Bilayer

• Carbohydrate Chains

• Protein Channels

• Cholesterol Molecules