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Cell Membrane - Cell Basis
This deck covers key concepts related to the cell membrane, including diffusion, osmosis, and the structure and function of the plasma membrane.
Diffusion is
Passive
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Key Terms
Term
Definition
Diffusion is
Passive
An artificial membrane separates two sides of a beaker... What will more likely be true?
About 25 glucose molecules will be on the right side of the beaker, and 25 will be on the left side of the beaker
You have a round pie plate filled with water... What happens to the red dye molecules?
Dye molecules move in all directions
If you wait for a long time, what will happen to the color of the water in the pie plate?
The entire pie plate will be faintly red
After waiting for a long time, the dye molecules in the pie plate will
Stop moving because they have reached equilibrium
Plants use sunlight to produce sugar... Would you expect plants to rely on diffusion to transport sugar to roots?
No, because it would take too long for the sugar molecules to diffuse that far
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| Term | Definition |
|---|---|
Diffusion is | Passive |
An artificial membrane separates two sides of a beaker... What will more likely be true? | About 25 glucose molecules will be on the right side of the beaker, and 25 will be on the left side of the beaker |
You have a round pie plate filled with water... What happens to the red dye molecules? | Dye molecules move in all directions |
If you wait for a long time, what will happen to the color of the water in the pie plate? | The entire pie plate will be faintly red |
After waiting for a long time, the dye molecules in the pie plate will | Stop moving because they have reached equilibrium |
Plants use sunlight to produce sugar... Would you expect plants to rely on diffusion to transport sugar to roots? | No, because it would take too long for the sugar molecules to diffuse that far |
A newly created sugar molecule is transported to the phloem through diffusion. This means that sugar molecules_______ | Move from an area of high concentration (in leaf cells) to low concentration (in phloem) through passive transport |
Could neurotransmitters cross the synaptic gap through diffusion? | Yes, because the neurotransmitters are at high concentration near the diffusing axon and at low concentration next to the receiving neuron |
If the tip of the axon is on the left, and the receiving neuron is on the right, which direction is a neurotransmitter molecule most likely to move? | To the right, toward the receiving neuron (down the concentration gradient) |
If you were to watch an individual neurotransmitter molecule just after it was released, what would happen to it? | It would move randomly in all directions, but with a net movement toward the receiving neuron |
During osmosis, individual molecules move: | Both directions |
Placing blood cells into a solution that is hypertonic will cause the osmotic pressure of the cells to: | Decrease |
Placing blood cells into a solution that is isotonic will cause the osmotic pressure of the cells to: | Neither increase nor decrease |
A system will reach equilibrium in osmosis when there are equal numbers of _______ molecules on both sides of the membrane | Water |
A SimCell with... 20 hemoglobin & 480 water is placed in fluid with 40 dextrose & 960 water. What happens? | Water molecules will move back and forth equally across the membrane |
A SimCell... with 50 dextrose, 25 glucose, 25 hemoglobin & 900 water is in a 1:15 solute:water fluid. What happens? | More water molecules will flow from the extracellular fluid into the SimCell than from the SimCell into the extracellular fluid |
A SimCell has a membrane permeable to alcohol but not to water. It’s placed in 40% alcohol solution. What happens? | Expand due to net movement of alcohol into the cell |
What is the outer boundary of the cell? | Plasma membrane |
Characteristics of an animal plasma membrane? | Provides mechanical strength and shape
Maintains cellular homeostasis
Regulates passage of molecules |
Fluid-mosaic model of plasma membrane structure | Phospholipid bilayer with embedded proteins |
Plasma membrane structure | Forms bilayer
Head is attracted toward water
Has fluid consistency |
How many heads do phospholipid molecules have? | One polar head |
Does the phospholipid bilayer have a solid consistency? | No |
Osmosis | Diffusion of water through a selectively permeable membrane |