Cell Transport Mechanisms and Processes

The video tutorial covers the last topic in the cell processes unit, focusing on cell transport mechanisms: diffusion, osmosis, and active transport. Diffusion is described as the movement of molecules from high to low concentration, requiring no energy. Osmosis is the diffusion of water across cell membranes, also energy-free. Active transport, in contrast, moves substances from low to high concentration using ATP. The importance of small cell size is highlighted, as it allows efficient transport of materials due to a larger surface area relative to volume.

Which of the following is NOT a type of cell transport process?

• Photosynthesis

• Active Transport

• Osmosis

• Diffusion

What is the primary characteristic of diffusion?

• Occurs only in liquids

• Movement from low to high concentration

• Movement from high to low concentration

• Requires energy

Which of the following is an example of diffusion?

• Water moving across a membrane

• Oxygen entering cells from the bloodstream

• Sugar dissolving in water

• ATP production in mitochondria

What is osmosis specifically concerned with?

• Movement of solutes

• Movement of water

• Movement of gases

• Movement of proteins

In osmosis, water moves from an area of _____ to an area of _____.

• low water concentration; high water concentration

• low solute concentration; high solute concentration

• high water concentration; low water concentration

• high solute concentration; low solute concentration

What happens to a cell in a hypertonic solution?

• It bursts

• It swells

• It shrinks

• It remains the same

Active transport requires which of the following?

• No energy

• ATP

• Diffusion

• Osmosis

Which process moves substances against their concentration gradient?

• Active Transport

• Osmosis

• Facilitated Diffusion

• Diffusion

Why are smaller cells more efficient in transport processes?

• They require more energy

• They have a larger surface area relative to volume

• They have more organelles

• They have a larger volume

What is the main advantage of having a larger surface area to volume ratio in cells?

• Faster ATP production

• Greater energy storage

• More efficient material exchange

• Increased cell division