Transcript Agenda
Wednesday 2/23 Please take out a pencil Colored Pencils Warm Up: With the person sitting next to you, talk about the steps of the cell cycle. Be able to name the stages of the cells life and steps of mitosis. Mitosis Cell Structure Review Instructions Each group will get 3 vocabulary words. Each person in the group will chose 1 of the words and draw a picture/pictures representing the word as well as write a definition that is easy to understand. Pictures must take up the whole box and be colored and labeled if needed. Eukaryotic Cells • • Have a nucleus Found in multi-cellular organisms & some unicellular organisms Prokaryotic Cells • • Do not have a nucleus Found in bacteria Cell Membrane • • • • Thin, flexible layer Separates the cell from its surrounding environment Controls movement of materials into and out of the cell Helps maintain the cell’s internal environment Cytoplasm • Thick, jelly-like substance contained within the cell membrane Nucleus • • • Control center of the cell Contains the genetic material (chromatin) the cell needs to reproduce and function. Is surrounded by the nuclear membrane Nuclear Membrane • membrane that separates the nucleus from the cytoplasm. Nucleolus Found inside the nucleus Helps make RNA If it malfunctions, it can cause many human diseases DNA • • • The genetic material found in all living cells. Contains the information needed for an organism to grow, maintain itself, and reproduce Stands for deoxyribonucleic acid Chromatin Chromosomes are not always visible. They usually sit around uncoiled and as loose strands called chromatin. Chromosome • • Worm-like / rodlike structures formed from chromatin during cell reproduction. They become distinct during the reproductive part of the cell cycle as the cell divides. Composed of DNA Sister Chromatids Pairs of chromosomes are called Sister Chromatids Structures called a Centromere hold the sister chromatids together Centrioles - Organizing Chromosomes Every animal-like cell has two small organelles called centrioles. They are there to help the cell when it comes time to divide. They are put to work in both the process of mitosis and the process of meiosis and move to opposite sides of the nucleus during cell division You will usually find them near the nucleus but they cannot be seen when the cell is not dividing. Spindle Fibers Spindle fibers form a protein strand that divides the chromosomes in a cell during cell division. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis. Aster & Centrosome An aster is a cellular structure shaped like a star, formed around each centrosome during mitosis in an animal cell Centrosome is where the centrioles are organized