DO NOW CP BIOLOGY 9/23/2022

The picture below is an example of _________________.

• osmosis
• isotonic
• diffusion
• active transport

What is the definition of  Selective Permeability?

• The movement of materials across the cell membrane that requires NO ENERGY from the cell.
  
• The movement of materials through (or across) the cell membrane
  
• The ability of the cell membrane to allow some things to pass through while preventing other things from passing through.
• The movement of molecules from an area of high concentration to a area of low concentration 
  

How do the particles move in diffusion?

• From a region of low concentration to a region of high concentration

• From a region of high concentration to a region of low concentration

• From a region of low concentration to a region of low concentration

• From a region of high concentration to a region of high concentration

What does a 'region with high concentration' mean?

• An area with a SMALL number of particles

• An area with a LARGE number of particles

• An area with an UNEVEN number of particles

• An area with no particles

What is DIFFUSION?

• 
• 
• 
• 

Which of the following is a function (job) of the cell membrane>

• breaks down lipids, carbohydrates, and proteins from food

• stores water, salt, proteins, and carbs

• keeps the cell wall in place

• regulates the movement of materials into and out of the cell

Another name for starch indicator solution is

• Benedict's solution

• Iodine

• Biological catalyst

• Semi-permeable

When iodine/starch indicator solution comes in contact with starch, which color change results?

• amber to blue-black

• blue to yellow/orange/brown

• amber to blue

• blue to amber

Which substance stayed inside the cell and did NOT diffuse across the membrane? Why?

• Glucose, it combined with starch inside the cell

• Water, because there were equal concentrations of water inside and outside the cell

• Iodine, because the fluid outside the cell was still amber colored

• Starch, because it is a large complex carbohydrate

_______ regulates what enters and leaves a cell.  

• Cell Membrane
• Nucleus
• Mitochondria
• Cytoplasm