Radiobiology Unit 1

Cell solvent temperature maintence transport vehicle

Proteins Lipids Carbohydrates Nucleic Acids

15% of cellular organic compounds basic building blocks include enzymes

A protein which serves as a catalyst to expedite other cellular actions

2% of cellular organic compounds "fats" part of the cell membrane energy storage, protection, temperature regulation

<1% of cellular organic compounds provide energy

<1% of cellular organic compounds direct cellular information aid in protein synthesis

SODIUM: outside the cell POTASSIUM: inside the cell maintain osmotic pressure

G1, S, G2, M

G1: resting phase following mitosis preceeding DNA synthesis S: DNA synthesis G2: resting stage after DNA synthesis M: mitosis

Prophase: chromatin become filamentous and visible Metaphase: chromatids aligned an the equatorial plate Anaphase: migrathion of chromatids along spindle to opposite poles Telophase: reconstruction of nuclear membrane and cytokinesis

DNA duplication occurs only once, but cell division occurs twice. This results in half the chromosomes in each of four gametes

Mitosis: 2n, 4n, 2n2n Meiosis: 2n, 4n, 2n2n, nnnn

Change in the balance between electrons and protons in the atom

Energy exchange resulting in an atom's outer shell electron moving further from the nucleus of the atom