Biology
What supplies the energy for active transport
ATP
What allows a cell to stockpile substances in far greater concentrations than they occur outside the cell
Active Transport
Heavy rain is to Flooding
As concentration difference osmosis
Differences and similarities between facilitated diffusion and active transport
Both use carrier proteins, active transport against the gradient, facilitated diffusion with the gradient
Explain facilitated diffusion In respect to the concentration gradient
Carrier protein changes shape to allow things in and out
What is dynamic equilibrium
Continuous movement but no change
What is a concentration gradient
Difference in concentration on either side of the membrane
Which of the following does not require an expenditure of energy: diffusion, active transport, endocytosis, or the sodium-potassium pump
Diffusion
What is the end result of diffusion
Eventually the concentration becomes balance on both side of the membrane
How do sugar molecules enter and leaves cells
Facilitated diffusion
Provide an example of passive transport
Facilitated diffusion
Sugar molecules enter
Facilitated diffusion
What is the major difference between facilitated diffusion and active transport
Facilitated diffusion goes with the gradient(high to low)and active transport doesn't do with gradient(low to high)
Distinguish facilitated diffusion from active transport
Facilitated high to low no energy, active transport- low to high need energy
Explain how diffusion takes place in accordance with the concentration gradient
From an area of high to low concentration
List type of molecules that enter the cell by means of facilitated diffusion
Glucose and amino acids
Describe how drop of dye illustrates the process of diffusion
High to low conentration
Tonicities
Hypotonic-cell swells Hypertonic- cell shrinks Isotonic-cell remains the same size
What happens to a plant cell when it is placed in a hypertonic environment
It causes turgur pressure to decrease
What in endocytosis
Large molecules enter the cell
What types of materials are expelled from cells during exocytosis
Large molecules like hormones
What is solubility
Materials that are soluble in lipids can pass through the cell membrane easily how things dissolve
Define diffusion and example
Molecules move high to low concentration, drop of dye in a beaker
Explain how carrier proteins proteins work in facilitated diffusion
Move in and out
Why is it dangerous for humans to drink ocean water (Essay)
Ocean water contains high concentration of salt, to much salt causes hypertonic situation and cells will be dehydrated
Define phagocytosis and pinocytosis
Phagocytosis- cellular eating pinocytosis- cellular drinking
List types of molecules that enter the cell by means of active transport
Potassium ion, large sugars, large proteins
Describe how the sodium potassium pump works
Pumps sodium ions out and potassium ions in, how your nerve impulses work
What helps nerve impulses occur
Sodium potassium pump
Explain a specific example of how ions are transported across cell membranes
Sodium potassium pump sends electrical signal to let ions move
What is osmosis
The diffusion of water across the cell membrane from high to low
What is exocytosis
The existing of large molecules
If add salt to a cell, diffusion takes place because
There is a concentration gradient, water will diffuse out of a cell so the cell reaches equilibrium
What happens to algal cells when they are in isotonic solutions and solutes are added to the solutions
They will shrink
What happens to a plant cell when it is a hypotonic solution
Turgur pressure to increase in the large central vacuole
List types of molecules that enter and leave the cell by means of simple of diffusion
Water, oxygen, carbon dioxide
Are ions channels specific
Yes specific for ions, calcium channel allows calcium
