Bell ringer: write the question What are the two types of homeostasis? List in order the levels of organization starting with an atom. How do unicellular organism maintain homeostasis? What is phagocytosis?

Why do cells divide? Cell division occurs in all organism Single celled organisms divide for reproduction Multi-celled organisms divide for growth, development, and repair, as well as reproduction

What is DNA? The genetic material in cells Contains information that determines the traits that living inherits and needs to live. DNA is found in the nucleus

What is the relationship between chromosomes, genes and DNA? The cells nucleus contains Chromosomes made from DNA DNA contains Genes A gene is a short section of DNA

What are the stages of the cell cycle? Interphase Mitosis Cytokinesis

Interphase The part of the cell cycle during which the cell is not dividing Cells spend most of their time in this stage Cell engages in normal life activities, such as transporting materials into the cell and getting rid of waste

Stages of interphase G1 S phase (synthesis) G2 G0 The time where the cell makes more proteins so that it can grow to its proper size S phase (synthesis) DNA is copied G2 When the cell replicates its organelles Does a last check to make sure everything is ready for division G0 Cells that become highly specialized Leave the cell cycle can occur after mitosis or before G1

Bell ringer *write the question In which portion of the cell cycle, do cells spend the majority of their time? When does DNA get replicated in the cell cycle? True/False Cell division occurs throughout the cell cycle What organism can ingest molecules using phagocytosis?

Mitosis The process by which cells divide Responsible for growth and repair Creates two identical cells The nucleus divides and creates two identical nuclei

What are the phases of mitosis? There are four major phases Prophase Metaphase Anaphase Telophase

cytokinesis The final step of cell division This is when the two cells are finally formed