Presentation on theme: "Every LIVING thing is made up of ONE or more cells."— Presentation transcript:
1Every LIVING thing is made up of ONE or more cells. The CellA CELL is the smallest unit that can carry on all the PROCESSES of life.Every LIVING thing is made up of ONE or more cells.
2A living thing that is made up of ONE cell is called UNICELLULAR. A living thing that is made up of MORE than one cell is aMULTICELLULARorganism.
3How many cells are there in a human body? Between 50 to 100 trillion depending on a person’s size!
4How many bacterial cells are there in and on a human body? 182 species of bacteria colonize the average person's skinThere are about 1,000,000 bacteria per square inch on human skinSaliva may contain up to 1,000,000,000 bacteria per milliliterWe have more bacteria living in and on us than cells in our bodies!Only about 10% of the cells in our bodies are Human!
6Cells were first discovered in 1665 by the English scientist Cell HistoryCells were first discovered in 1665 by the English scientistROBERT HOOKE.
7Hooke cut a piece of CORK and observed it with a microscope.
8He sectioned other specimens and saw that they were all made up of ”LITTLE BOXES,” or cells, which reminded him of the little rooms MONKS of that time lived in.
9The first person to view LIVING cells was Anton VAN LEEUWENHOEKIn 1675I’m Anton
10It took another 150 years for scientists to take the work of HOOKE andVAN LEEUWENHOEK,And devise a unified theory of cells.
11In 1838 a GERMAN botanist, Matthias SCHLEIDEN concluded that all plants were COMPOSED of cells.
12In 1855 a German PHYSICIAN, Rudolph VIRCHOW determined that cells only come from other CELLS.
13The observations of these three scientists are known as CELL THEORY
141. All living things are COMPOSED of one or more CELLS. Cell Theory1. All living things are COMPOSED of one or more CELLS.2. Cells are organisms BASIC UNITS of structure and function.3. Cells come only from OTHER cells.
15Cells vary greatly in SIZE, SHAPE, and internal ORGANIZATION. Cell DiversityCells vary greatly in SIZE, SHAPE,and internal ORGANIZATION.
16SizeCells must maintain a SMALL size or else their surface area becomes too SMALL to maintain all life functions.
17ShapeMost cells are SPHERICAL or CUBOIDAL. They can also be FLAT like skin cells,have long extensions like NERVE cells, or may have the ability to change SHAPE like white BLOOD cells.
18Internal Organization Cells differ in their internal organization. Cells that contain a NUCLEUS and membrane bound ORGANELLES are called EUKARYOTES.Examples:PLANT & ANIMAL cells
19Cells that lack a NUCLEUS and membrane BOUND organelles are called PROKARYOTES. Example:BACTERIA CELLS
30cytoplasmIs the JELLYLIKE material found inside the cell membrane and is made up of WATER, salts, and organic molecules.
31It is in constant motion called CYTOPLASMIC streaming. The cytoplasm surrounds“little organs” orORGANELLESwhich each havea specific job.
32ribosomesAre the organelles where PROTEINS are made and are the most NUMEROUS of the organelles.
33endoplasmic reticulum (ER) is a membrane system of folded SACS and tunnels. There are two kinds of ER.
34Rough ER (rER)(rER) is studded withRIBOSOMES. Is abundant in cells that export a lot of proteins or ENZYMES like the pancreas.
35Smooth ER (sER)(sER) has no RIBOSOMESAnd is like a highway for molecules to move around the cell and as a STORAGE area.
36golgi apparatusIs the processing, PACKAGING, and secreting organelle of the cell. It is like a factory where a product is ASSEMBLED at one end, packaged, then put into a mail bag for delivery at the other end.
37mitochondriaAre the POWERHOUSES of the cell that process and release ENERGY from the nutrients that enter the cell.
39They have CRISTAE which make more surface area for cellular respiration to take place, and ATP is formed here. Cells that use a lot of energy like muscle cells have many mitochondria. Mitochondria havetheir own DNA.
40Are the garbage men of the cell and contain lysosomesAre the garbage men of the cell and containDIGESTIVE enzymes that break down wastes.
41Provide a frame for the cell called the microtubules andmicrofilamentsProvide a frame for the cell called theCYTOSKELETON.They also help move things around in the cell.
42Are used in MOVEMENT and extend out from cilia and flagellaAre used in MOVEMENT and extend out fromthe surface of the cell.Cilia are short and hairlike. They beat in WAVES. Flagella are long and whiplike, occur SINGLY or in pairs.
43The NucleusDirects the ACTIVITIES of the cell. It is surrounded by a NUCLEAR membrane that has holes in it where molecules can enter and EXIT.
44The nucleus contains CHROMATIN, strands of DNA and proteins The nucleus contains CHROMATIN, strands of DNA and proteins. When it condenses, it forms CHROMOSOMES, the genetic information of the cell.The NUCLEOLUS is a spherical body in the nucleus where ribosomes are made.
47Plant cells differ from ANIMAL cells because they have a cell WALL that surrounds the cell MEMBRANE. This helps support and protect the cell. They also have sacs called VACUOLES and plastids which store food or pigments.
48chloroplastsContain a green pigment called CHLOROPHYLL that is used in photosynthesis.
49ChromoplastsContain pigments like orange CAROTENES, and yellow XANTHOPHYLLS, and red pigments. They give plants their distinctive colors.
50LeucoplastsStore food such as STARCHES, proteins, and lipids. They are storage organs in potato TUBERS.