Exploring Cell Theory and Membranes

Who is credited with the development of the cell theory?

• Charles Darwin

• Gregor Mendel

• Louis Pasteur

• Matthias Schleiden and Theodor Schwann

What are the three main components of the cell theory?

• Cells can spontaneously generate from non-living matter.

• All cells are identical in structure and function.

• All cells contain DNA.

• 1. All living organisms are composed of cells. 2. The cell is the basic unit of life. 3. All cells arise from pre-existing cells.

In what year was the term 'cell' first used?

• 1665

• 1625

• 1700

• 1650

What is the primary function of the cell membrane?

• The primary function of the cell membrane is to control the movement of substances in and out of the cell.

• To facilitate protein synthesis

• To store genetic information

• To provide structural support to the cell

What does the term 'selectively permeable' mean in relation to cell membranes?

• Selectively permeable means that a cell membrane is completely impermeable to all substances.

• Selectively permeable indicates that a cell membrane can only allow gases to pass through.

• Selectively permeable means that a cell membrane allows some substances to pass while restricting others.

• Selectively permeable refers to the ability of a cell membrane to allow all substances to pass freely.

Name one type of transport that does not require energy.

• Diffusion

• Osmosis

• Facilitated diffusion

• Active transport

What is osmosis?

• Osmosis is the absorption of nutrients by plants.

• Osmosis is the movement of water across a membrane due to concentration differences.

• Osmosis is the process of energy production in cells.

• Osmosis refers to the movement of solutes across a membrane.

How do proteins assist in the transport across the cell membrane?

• Proteins form a protective barrier around the cell.

• Proteins break down molecules for energy.

• Proteins generate electrical signals for communication.

• Proteins assist in transport by acting as channels or carriers for molecules across the cell membrane.

What is the difference between passive and active transport?

• Both passive and active transport require energy to function.

• Active transport is energy-free and moves with the gradient.

• Passive transport requires energy and moves against the gradient.

• Passive transport is energy-free and moves with the gradient; active transport requires energy and moves against the gradient.

Why is the fluid mosaic model important for understanding cell membranes?

• It explains the rigid structure of cell membranes.

• It describes the genetic material within the cell.

• The fluid mosaic model is important for understanding cell membranes because it illustrates their dynamic structure and the interactions between various components, which are crucial for membrane function.

• It focuses solely on the lipid bilayer without proteins.