CALCULATION
Describe what happens to an atom when it undergoes radioactive decay.
Atom will lose proton, and therefore form new element to become more stable.
Define Radioactive half-life.
Time required which half of a given number of radioactive nuclei decay and half remains un-decay
, Madam mas
1. solution and difusion
Simple diffusion: random movement of ions or molecules from areas of high concentration to areas of
low concentration
Purpose of simple diffusion
*diffusion of useful substances like nutrients, water and oxygen into cells
*excretion of metabolic waste product like ammonia, water and mineral salts from the cells
*enable unicellular organism to take oxygen and excrete its waste product like carbon dioxide
Facilitated diffusion
Assisted by channel or carrier proteins because some of the molecules are to big to pass through tiny
pores in the lipid bilayer
Example molecule used channel protein
Water and ions
Example molecule used carrier protein
Sugar,amino acids neuclosides
Osmosis
Passage of water from areas of high water concentration through semi permeable membrane to a areas
of lower concentration
(sama macam diffusion bezanya random movement of ions or molecules through semi-permeable membrane)
• Hypotonic
A solution that has lower osmotic pressure than another solution
(less solute, more solvent)
• Hypertonic
A solution that has a greater osmotic pressure than another solution
(more solute, less solvent)
• Isotonic
Solution that have the same osmotic pressure
Describe what happens to an atom when it undergoes radioactive decay.
Atom will lose proton, and therefore form new element to become more stable.
Define Radioactive half-life.
Time required which half of a given number of radioactive nuclei decay and half remains un-decay
, Madam mas
1. solution and difusion
Simple diffusion: random movement of ions or molecules from areas of high concentration to areas of
low concentration
Purpose of simple diffusion
*diffusion of useful substances like nutrients, water and oxygen into cells
*excretion of metabolic waste product like ammonia, water and mineral salts from the cells
*enable unicellular organism to take oxygen and excrete its waste product like carbon dioxide
Facilitated diffusion
Assisted by channel or carrier proteins because some of the molecules are to big to pass through tiny
pores in the lipid bilayer
Example molecule used channel protein
Water and ions
Example molecule used carrier protein
Sugar,amino acids neuclosides
Osmosis
Passage of water from areas of high water concentration through semi permeable membrane to a areas
of lower concentration
(sama macam diffusion bezanya random movement of ions or molecules through semi-permeable membrane)
• Hypotonic
A solution that has lower osmotic pressure than another solution
(less solute, more solvent)
• Hypertonic
A solution that has a greater osmotic pressure than another solution
(more solute, less solvent)
• Isotonic
Solution that have the same osmotic pressure
