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Unformatted text preview: Cells and Cell Division
Chapter 2 Part 1 Cells Human Cell Fig. 2.1 Cell = Cells Smallest living unit Human cells have similar basic structure Differences based on function Cell Components Plasma membrane Cytoplasm = Membranebound nucleus Organelles Plasma Membrane Doublelayered structure Selectively permeable What's that mean? Function = Contains identification molecules Plasma Membrane Fig. 2.2 Plasma Membrane Molecules Production of molecules is genetically controlled Functions: Cystic fibrosis malfunction of chlorine channel The Organelles Nucleus Nucleolus Endoplasmic reticulum Ribosomes Golgi apparatus Lysosomes Vessicles Mitochondria Nucleus Has a doublelayered membrane Nuclear envelope Has holes (called nuclear pores) Stuff in the nucleus: Nucleoli makes ribosomes Chromatin (makes up chromosomes) Nucleus Fig. 2.6a Human Chromosomes In nucleus: DNA organized into chromosomes How many do humans have? What is the difference (in terms of chromosomes) between males and females? Endoplasmic Reticulum (ER) Network of membranes forms channels Functions: protein folding, processing, and transport Rough ER has ribosomes Ribosomes Found on ER and in cytoplasm Function: synthesizes protein Endoplasmic Reticulum Fig. 2.3 Golgi Apparatus Stacks of flattened membranes Mmmm, pancakes Sort, modify, and package proteins in the cell Golgi make lysosomes Lysosomes Contains hydrolytic enzyme What are they? Functions: Breakdown materials coming into cell Recycle old organelles Vessicles "Bubbles" of cell membrane Can be used for: Transport Storage Several specialized types (lysosomes) Golgi Apparatus Fig. 2.4 Mitochondria Site of cellular respiration What does this mean? Produces ATP Contain their own DNA Passed down maternally Mitochondrion Fig. 2.5 Ok, Now it's your turn.... I want you to come up with an analogy for each part of the cell we have discussed (as well as the rationale behind your analogy). share with the class (so keep it clean folks). Work in pairs for this and be ready to ...
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- Fall '07