2 Discovery of Cells Too small to be seen Microscopes invented: opening up the world of tiny thingsRobert Hooke was the first to see them
3 The Discovery of Cells 1665, Robert Hooke Looked at cork Named them “cells” after rooms in monasteries
4 The Cell Theory- Part 1Cells are the building blocks of all living thingsThey make up everything that is aliveLarger organism have more cellsWhy would Hooke see cells in cork?
5 The Cell Theory- Part 2 All life activities take place in cells Different types of cells do different thingsExample: muscle cells contract to make us move
6 The Cell Theory- Part 3 New cells are made from old cells Living things grow larger from their cells producing more cellsNew cells replace old cellsEx: dry skin falls off, new skin cells replace the old
7 Questions about the discovery of cells Who first discovered cells?Before the invention of the microscope, why couldn’t scientists learn what living things were made of?Are all cells alike?Are all organisms made up of millions of cells?How does an organism grow?Why don’t all cells look exactly alike?In what ways are cells different?In what ways are cells alike?What are the three parts of the cell theory?
8 The Parts of a cell An animal cell Cell membrane Vacuoles Chromosomes Nuclear membraneNucleusCytoplasmMitochondria
9 Parts of a cell A plant cell Same parts as animal cell plus: Cell wall Chloroplasts
10 To help you remember… Mighty Mitochondria Vacuum like Vacuoles Cell and nuclear membrane
11 To help you remember about the plant cell…. Cell wall: gives plant cell it’s shapeChloroplasts: contain chlorophyllMakes plant food…Makes plant green
12 Questions about cell parts How are you similar to a flower or a bird?What two structures do plant cells have that animal cells do not have?What is the function of the cell wall?Why don’t animal cells have chloroplasts?What part gives the cell power?
13 The Nucleus of the CellThe nucleus is the control center or brain of the cellContains ChromosomesChromosomes are made up of DNA “blueprint of life”Makes up who you are
14 Questions about the nucleus Why do you think the nucleus is sometimes called the brain of the cell?How are chromosomes and DNA related?What is DNA?