Extracellular Matrix and Cell Membrane Functions

What is the primary function of the cell membrane?

• To produce energy for the cell.

• To store genetic material.

• To control the movement of substances into and out of the cell.

• To provide structural support to the cell's interior.

Which of the following are key components of the extracellular matrix?

• Lipids, carbohydrates, and nucleic acids.

• Proteins, carbohydrate chains, and water.

• Phospholipids, cholesterol, and enzymes.

• DNA, RNA, and amino acids.

Why is the extracellular matrix of each organ unique to its function?

• It determines the organ's color and texture.

• It provides specific structural support and helps cells maintain their shape.

• It regulates the organ's temperature.

• It controls the organ's metabolic rate.

How do phospholipid molecules arrange themselves to form the cell membrane's bilayer structure?

• The water-loving tails face outwards, and the water-hating heads face inwards.

• The water-hating tails face outwards, and the water-loving heads face inwards.

• The water-loving heads face outwards, and the water-hating tails face inwards, forming two layers.

• They randomly arrange themselves without a specific orientation.

What is the primary characteristic of the Fluid Mosaic Model of the cell membrane?

• It describes the cell membrane as a rigid, static structure.

• It highlights the dynamic movement of proteins within a fluid lipid bilayer.

• It suggests that the cell membrane is composed solely of phospholipids.

• It explains how cells actively transport all substances across the membrane.

What is a key function of glycoproteins on the surface of cells?

• They primarily act as channels for active transport of ions.

• They are responsible for generating energy for cellular processes.

• They help the immune system distinguish self from non-self and facilitate cell communication.

• They form tight junctions between adjacent cells.

Which statement accurately describes passive transport across a cell membrane?

• It requires the cell to expend metabolic energy.

• It moves substances against their concentration gradient.

• It relies on the natural movement of substances from an area of higher concentration to lower concentration.

• It is exclusively carried out by transport proteins.

How does facilitated diffusion differ from simple diffusion?

• Facilitated diffusion requires energy, while simple diffusion does not.

• Facilitated diffusion moves substances against their concentration gradient, while simple diffusion moves them down.

• Facilitated diffusion requires the assistance of transport proteins, while simple diffusion does not.

• Facilitated diffusion is only for water molecules, while simple diffusion is for all other substances.