ONS/ONCC Chemotherapy Immunotherapy Certificate Certified Questions and Answers update

Lesson 1: Foundations to Set the Stage - Focusing on Cellular Structure and Function - The Normal Cell Cycle - -The cell cycle refers to the ordered seres of processes of DNA replication and mitosis, or cell division -Cell nucleus regulates these processes by gathering and processing complexes molecular information Interphase and Mitotic Phase - Cell division produces two identical cells through these two major phases During interphase: - Cell grows and DNA is replicated through the following three steps: 1: First growth phase (G1 or first gap) 2: Synthesis phase (S phase) 3:Mitotic Phse (M phase) First Growth Phase (G1 or first gap) - -cells increase in size -reproduce RNA -"quality assurance" test that the cell will be ready to synthesis DNA -Length of time is variable, can be from hours to days Synthesis Phase (S phase) - -DNA replicates -Results in the formation of identical pairs of DNA (chromatids) -which are attached a t the centromere -lasts 2-10 hours Mitotic Phase (M phase) - -Replicated chromosomes are aligned, separated, and move into 2 new, identical daughter cells -takes about 30-60 minutes Major points of cell regulation are entry and exit from - -G1 checkpoint -S Phase -G2 checkpoint -M phase Restriction Point - -The transition from the resting phase into an actively dividing phase (G0-G1) is a point where cellular transformation can occur -During this time, cells pass through a transition phase known as a restriction point -Extracellular growth factors trigger reentry into G1, and GF are required to send the cells past the restriction point, or the point of no return G0 Phase (resting phase) - -After mitosis, cells may enter back into the G1 phase or go into a resting phase, known as G0 -Most cells in the human body reside in G0 -Exceptions to this are those that are (Resting in G0 phase) - -Exceptions to this are those that are metabollically active, such as -granulocytes -and the epithelium of the GI tract Cell Cycling Time - Amount of time from mitosis to mitosis