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Rad biology Unit 2

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
Created by: atesta0824