Passive and Active Transport

_______ regulates what enters and leaves a cell.  

• Cell Membrane
• Nucleus
• Mitochondria
• Cytoplasm

Which type of passive transport uses proteins to help molecules pass through the membrane?

• Diffusion
• Facilitated diffusion
• Osmosis
• All of the above

Cell membranes are described as selectively permeable.

Four students were asked to explain what this means. Which one is correct?

• Student 1: Cell membranes prevent all materials from entering the cell.

• Student 2: Cell membranes only provide structural support for the cell.

• Student 3: Cell membranes regulate which substances can enter and exit the cell.

• Student 4: Cell membranes allow water and water-soluble substances to enter the cell.

Passive Transport

• Does require cell energy

• Does NOT require cell energy

What is diffusion?

• when molecules move from a low concentration to a high concentration 
• when molecules move from a high concentration to a low concentration.
• no movement 
• molecules move everywhere

What biomolecule is number one pointing to?

• Lipid

• Protein

• Nucleic Acid

• Carbohydrate

What type of transport uses a transport protein?

• Osmosis

• Facilitated diffusion

This example of passive transport is the movement of water to an area of low to high concentration of solutes. 

• osmosis
• concentration gradient
• isotonic
• facilitated diffusion

Passive transport requires no

• concentration gradients
• osmosis
• motion
• energy

Osmosis is the diffusion of _____ across a membrane

• glucose
• NaCl
• proteins
• water