Transcript sol5_5
Living Systems Bacteria and Protists All living things are made up of cells. • Bacteria cells • Plant cells • Animal cells • Fungi cells and • Protozoan cells Bacteria Cells • Single-celled organisms • No true nucleus Bacteria cells have: • Cytoplasm, • a cell wall, and • a cell membrane. • Some bacteria are harmful while others are helpful. Bacteria cells • Bacteria are the smallest and simplest organisms in the world • Bacteria can be found everywhere life is. Bacteria cells cheese yogurt Pickled eggs • Bacteria can be helpful • 1. Feed on dead matter=decomposers; • 2.Make certain foodscheese, pickles, yogurt, butter, chocolates; 3. In our intestines bacteria make vitamins and help digest foods. A drawing of a bacteria cell. Bacteria cell cell wall & cell membrane cytoplasm *nuclear material Question #1: • 1 It is easy to identify a bacteria cell under the microscope because it doesn’t haveA B C D cell membrane cell wall cytoplasm nuclear membrane Answer to question #1. • You got it! D • Bacteria do not have a true nucleus so they don’t have a nuclear membrane. Protozoan cells • These organisms are single celled • Some are consumers, • Some are producers, • Some eat food AND need sun light for photosynthesis. • Can you name a few protozoa? Kingdom Protista Amoeba nucleus Cell membrane cytoplasm • Single celled organisms. • Cell membrane is on the outside to protect the cell and help matter move in and out of the cell. • Cytoplasm is the clear jelly like matter that protects the inside cell parts. Kingdom Protists • Some Protozoan cells have several nuclei. • The Nucleus is the control center of the cell. This organelle tells the cell what to do. Large Nucleus & nucleolus micronucleus These microorganisms live in moist environments. Paramecium The World of Protists • Protists live in lakes, rivers, oceans, and damp soil. • Most protists are single-celled and contain a nucleus and other cell structures needed to carry out their basic life functions. • Some protists are multicellular and have more than one cell. • Animal-like protists are called protozoans. • Amoebas, paramecium, and Euglena. The World of Protists • Plant-like protists can produce their own food by using the Sun’s energy. Euglena eyespot • Plant-like protists have chlorophyll, a green pigment. • Euglena are animal-like & plant-like. nucleus chloroplast Question #2 • Inside of a cell, many materials and organelles are suspended and protected by this gelatin like substanceF G H J cell wall cell membrane cytoplasm chloroplasts • You did it again! H • Yes, cytoplasm is the gelatin like or clear jello like substance that protects and suspends all the internal cell organelles.