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Biology

Terms in this set (59)

Phospholipids are considered "dual-natured", what is it about their structure that makes them have two "natures"?
They have a polar head and a fatty acid tail that is non polar(hydrophobic) So they automatically form a lipid bilayer, making them dual nature.
Why is the cell membrane a bilayer of phospholipids?
This helps us to separate the cell from the aqueous environment
Describe the fluid mosaic model of the plasma membrane. What does "mosaic" refer to? What does "fluid" refer to?
Describes the cell membrane part the cell. The mosaic is the proteins and the fluid is the phospholipid that is able to move.
What does it mean when we say that the plasma membrane is selectively permeable?
It will only allow some things to go through it.
Why is the plasma membrane selectively permeable?
It allows some things through, but keeps other things out
What types of molecules can move through the membrane via simple diffusion?
oxygen and CO2 small nonpolar molecules can pass
What is the difference between simple diffusion and facilitated diffusion?
Facilitated need help to get across, and simple needs no help, go from more to less
Is osmosis an example of passive transport or active transport?
Osmosis goes down gradient so it it passive.
If solution A is hypertonic to solution B and they are separated by a semipermeable membrane, where will the water move?
The water will move to the hypertonic solution since there is less water in the A solution.
If a red blood cell is placed in a beaker of pure water, what will happen to it?
Since it is hypertonic compared to the water, it will gain water and combust and swell.
NAPD
carrier molecule that transfers high-energy electrons from chlorophyll to other molecules
ATP
(adenosine triphosphate) main energy source that cells use for most of their work
If a plant cell is placed in a beaker with really salty water, what will happen to it?
The cell would have a higher concentration of water so its water would leave to the salty water causing the plant to wilt
Explain two ways that active transport is different from diffusion
Passive transport goes down the gradient (goes to where there is more solute), active transport requires energy and goes from more solute
Compare and contrast endocytosis and exocytosis
Both are forms of active transport. Endocytosis is when a cell takes in particles from the outside, and exocytosis is when the cell releases something to the outside.
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