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Rad biology Unit 2
Question | Answer |
---|---|
Define target | The area that controls or carries out a cellular function |
Define free radical | A single unpaired orbital electron in the valence or outermost shell of an uncharged atom |
Define Paulis exculsion principle | If there is an odd number of electrons in an orbit, pairing cannot occur yielding a Free radical. free radicals occur only through indirect action of radiation |
What is the symbol for hydrogen ion? | H+ |
What is the symbol for hydroxyl ion? | OH- |
What is the symbol for hydrogen free radical | H' |
What is the symbol for an unpaired electron | ' |
What is the symbol for hydroxyl free radical | OH' |
The more water a target has, the more what occurs | interaction |
List the 5 categories of reactions with free radicals? (All start with reaction of free radicals with) | 1.Themselves 2.With water in which they are formed 3. with their own reaction porducts 4. with organic molecules 5. with oxygen |
complete the equation of the reaction of free radicals with themselves | 1.H' +OH'=H2O 2. H'+H'=H2 3. OH'+OH'=H2O2 |
complete the equation of the reaction of free radicals with water in whic they are formed | 1. H'+H2O=H2O+H' |
Complete the equations of the reaction of free radicals with their own reaction products | 1.H2+OH'=H'+H2O 2.H2O+OH'=H2O+HO2' 3. HO2'+HO2'=H2O2+O2 4. HO2'+OH'=H2O+O2 |
Complete the equation of the reaction of free radicals with organic molecules | 1.HO'+RH=R'+H2O2 2. HO2'+RH=RO'+H2O |
How does hydration affect radiosensitivity and why? | As a general rule, living systems containing little water are much less sensitive to radiation than organisms which exist in highly hydrated states |
What 4 things can occur to a cell after direct or indirect action? | 1. not be damaged 2. Be damaged but repair itself 3. be damaged and change function 4. be damaged and die |
Give the equation for radiolysis of water (direct action) | H2O----> H2O+ + e- |
Give the equation for radiolysis of water(indirect action) | e- + H20----> H2O |
What is the symbol for a negative ion | e- |
What is the difference between direct and indirect action of radiation of the cells? | direct-is a change brought about in any given molecule by radiation through direct ionization or excitation and indirect is a change produced in molecules when they react with other molecules that have been directly ionized or excited by radiation |
What percent of the cell in composed of water | 70%-80% |
When cells are irrated , most of the energy transfer goes to what | water |