Movement across membranes (Movement of substances across cell membranes)

Question 1

Movement of substances across cell membranes

Answer 1

• Lipid bilayer do not allow many compounds or molecules to pass through them freely
• Small, uncharged molecules cross membrane relatively easily

-Specific mechanisms are required for the controlled transport of many substances across membranes

Question 2

Types of transport

Answer 2

• Simple diffusion
• Diffusion through a channel
• Facilitated diffusion
• Active Transport