* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download 3 The cell as the basic unit of life
Survey
Document related concepts
Biochemical switches in the cell cycle wikipedia , lookup
Signal transduction wikipedia , lookup
Cytoplasmic streaming wikipedia , lookup
Cell membrane wikipedia , lookup
Cell nucleus wikipedia , lookup
Cell encapsulation wikipedia , lookup
Extracellular matrix wikipedia , lookup
Programmed cell death wikipedia , lookup
Cellular differentiation wikipedia , lookup
Endomembrane system wikipedia , lookup
Tissue engineering wikipedia , lookup
Cell growth wikipedia , lookup
Cell culture wikipedia , lookup
Cytokinesis wikipedia , lookup
Transcript
3 The cell as the basic unit of life Class Practice 3.1 Discovery of cells 3.2 Microscope A. A objective B clip C stage D condenser E mirror B. F G H eyepiece course adjustment fine adjustment I 1. 2. 3. 4. 5. 6. revolving nosepiece G D E C B A 7. 8. 9. I F H 3.3 Basic structure of a cell A. 1. a 2. c 3. c 4. b 5. 6. 7. 8. 9. a c a c a B. 1. 2. 3. 4. 5. 6. 7. 8. cell membrane cytoplasm mitochondria chloroplasts cell wall nucleus vacuole chromosomes 3.4 The similarities and differences between plant and animal cells 3.5 The cell as a basic unit of life 1. 2. nucleus cell tissue organ system organism (i) E (ii) C, D (iii) D (iv) A (v) B Exam Practice A. Multiple Choice Questions 1. C 2. C 3. B 4. C 5. D 6. D 7. C 8. B. C Structured Questions 1. (a) A cell wall B cell membrane C nucleus D cytoplasm E chloroplast F vacuole (b) (i) It protects and supports the cell. It resists the entry of excess water into the cell. (ii) It controls the normal activities of the cell. (c) Photosynthesis (d) Mitochondria. Respiration occurs in mitochondria to release energy. 2. 1 (e) cell 1 = ―― = 100 0.01 2 cell 2 = ――― = 400 0.005 (a) 50X (b) 10 × 40 = 400X (c) (i) They look bigger. (ii) A smaller area of the slide can be observed. C. STS Connections (a) Tissue level and system level. Similar cells group together to form a tissue. Several different tissues form a functional unit called organ. Several organs and tissues working for the same ultimate functions form a system. (b) organ level (c) The skin cells degenerate continuously and those dead cells are pushed towards the skin surface where they are rubbed off or detach automatically. His skin still functions well because many skin cells can be recovered by cell division.