2. immune globulin. gamma rays (Î³-rays) electromagnetic emissions from radioactive substances; they are similar to and have the same general properties as x-rays but are produced through the disintegration of certain radioactive elements.. immune globulin. gamma rays (Î³-rays) electromagnetic emissions from radioactive substances; they are similar to and have the same general properties as x-rays but are produced through the disintegration of certain radioactive elements.
3. The chromosomes in the cell nucleus would contain the most radioactivity because thymine is part of the DNA molecule and chromo-somes are composed of DNA. Inclusion/Special Needs Show students a picture of a bacterial cell and an animal cell. Talk about the location of DNA in each cell and where DNA replication occurs.
Radioactivity usually results from nuclear reactions, that is, reactions which involve the. breaking of nuclear bonds having energies of the order of 106 eV = 1MeV. The three most. common types of radioactive emissions are: alpha rays: Î± rays or Î± particles are high-energy helium nuclei (2 protons + 2 neutrons), which. are spontaneously emitted during the decay of radioactive nuclei. Î±-rays are extremely. dangerous, but, fortunately, they have very little penetrating power.