CellsandTheirOrganelles-Ning：细胞及其细胞器-宁.docVIP

Cells and Their Organelles The cell is the basic unit of life. The following is a glossary of animal cell terms. All cells are surrounded by a cell membrane. The cell membrane is semipermeable, allowing some substances to pass into the cell and blocking others. It is composed of a double layer of phospholipids and embedded proteins. Color and label the cell membrane tan. Plant cells have an additional layer surrounding them called the cell wall. The cell wall is made of nonliving material called cellulose. Color and label the cell wall brown. The centrosome (also called the microtubule organizing center) is a small body located near the nucleus. The centrosome is where microtubules are made. During cell division (mitosis), the centrosome divides and the two parts move to opposite sides of the dividing cell. The centriole is the dense center of the centrosome. Only animal cells have centrosomes. Color and label the centrioles purple. Microtubules are shaped like soda straws and give the nucleus and cell its shape. Label the microtubules inside the nucleus. At what level of organization does life begin? Cells. What surrounds all cells? A membrane. What is meant by semipermeable? Some substances are allowed to pass and others are blocked. What 2 things make up the cell membrane? Phospolipids and embedded proteins. The cell membrane is also called the_P_ ___ ___ ___ ___ ___ membrane. Centrioles are found inside of what type of cell? Animal cells. What additional layer is found around the outside of plant cells and bacteria? Cell Wall. Centrioles are found at the center of the_C_ _e__ __n_ __t_ _r__ _o__ _s__ __o_ __m_ __e__. How do they help the cell? They help the cell divide during mitosis. The nucleus in the center of a cell is a spherical body containing the nucleolus that makes ribosomes. The nucleus controls many of the functions of the cell (by controlling protein synthesis). It also contains DNA assembled into chromosomes. The nucleus