Cell Division

3 reasons cells need to divide ReasonWhy

3 reasons cells need to divide ReasonWhy Growth Repair Reproduction

3 reasons cells need to divide ReasonWhy GrowthAn individual cell cannot grow very large so it has to split into two cells with the same function Repair Reproduction

3 reasons cells need to divide ReasonWhy GrowthAn individual cell cannot grow very large so it has to split into two cells with the same function RepairCells don’t live as long as we do. We need to replace cells that die. Reproduction

3 reasons cells need to divide ReasonWhy GrowthAn individual cell cannot grow very large so it has to split into two cells with the same function RepairCells don’t live as long as we do. We need to replace cells that die. ReproductionOrganisms made of one cell need to divide to make new organisms

Cell structures needed for cell division Nucleus: The control center of the cell -It directs cell division -Contents of the nucleus for cell division

Cell structures needed for cell division Nucleus: The control center of the cell -It directs cell division -Contents of the nucleus for cell division -Chromosomes: The material that directs all the activities of the cell. -Made of DNA (deoxyribonucleic acid) -Nucleolus: Makes the ribosomes and ships them out to the cell.

Chromosomes and DNA

What is DNA made of? The structure of DNA looks like a twisted ladder. – The sides of the ladder are made from sugar- phosphate chains – The steps of the ladder are made from two of the four nitrogenous bases Adenine Cytosine Thymine Guanine

What is DNA made of?.

Which nitrogenous bases pair up?

DNA Replication Before a cell divides it needs to make sure it has two copies of DNA. To make this copy it unzips and new pieces of DNA fill in the other sides