1.1 - Movement across membranes

What are the 3 main processes allow molecules to move over membranes?

• osmosis

• diffusion

• active transport

• equilibrium

name 2 substances which pass into cells by diffusion

• glucose

• amino acids

• protein

• starch

name the gas which diffuses out of cells as a waste product

osmosis occurs over a what type of membrane?

Equilibrium occurs when there is no?

• overall net movement of particles

• particles available

• energy left

• selectively permeable membrane

which of the following can increase the rate of diffusion?

• Increasing temperature

• Decreasing temperature

• Increasing pressure

• decreasing pressure

What molecules are too big too pass through the membranes?

• Starch

• Protein

• Glucose

• Amino acids

What is the function of the cell membrane?

• Controls the cell

• releases energy

• Controls entry and exit of substances into and out of cell

• Contains chromosomes

Diffusion is?

• The random net movement of particles from an area of HIGHER to LOWER concentration

• energy requiring

• equilibrium

• the random movement of particles from a LOWER to HIGHER concentration

OSMOSIS INVOLVES THE MOVEMENT OF

• water molecules

• glucose molecules

• salt

• amino acids