The video explains the structure and function of cell membranes, highlighting their selective permeability, dynamic nature, and role in regulating substance exchange. It covers membrane components like phospholipids, proteins, and carbohydrates, and discusses passive and active transport mechanisms, including diffusion and the sodium-potassium pump.

What is the primary function of the cell membrane?

• To store genetic information

• To provide energy to the cell

• To control traffic into and out of the cell

• To produce proteins

Which of the following is NOT a component of the cell membrane?

• Carbohydrates

• Cholesterol

• Phospholipids

• Nucleic acids

What is the arrangement of phospholipids in the cell membrane called?

• Lipid quadrilayer

• Lipid trilayer

• Lipid bilayer

• Lipid monolayer

What property allows the cell membrane to be dynamic and responsive to environmental changes?

• Membrane fluidity

• Membrane thickness

• Membrane permeability

• Membrane rigidity

Which type of protein helps immune cells recognize the cell as its own type?

• Transport proteins

• Receptor proteins

• Structural proteins

• Glycoproteins

What is the process called when water diffuses through a selectively permeable membrane?

• Endocytosis

• Active transport

• Facilitated diffusion

• Osmosis

What happens to a cell in a hypertonic solution?

• It shrinks

• It bursts

• It remains the same

• It swells

Tags

NGSS.HS-LS1-3

Which specialized proteins allow for higher levels of water permeability in certain cells?

• Channel proteins

• Receptor proteins

• Aquaporins

• Carrier proteins

What is the main function of the sodium-potassium pump?

• To pump sodium ions into the cell

• To facilitate diffusion of glucose

• To transport water across the cell membrane

• To pump sodium ions out of the cell and potassium ions into the cell

Tags

NGSS.HS-LS1-3

What powers the changes in conformation of the sodium-potassium pump?

• Glucose

• ATP

• Oxygen

• Carbon dioxide