LS 2 Lecture 2

LS 2 Lecture 2 - Life Sciences 2 Cells: The Working Units...

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1 Life Sciences 2 Cells: The Working Units of Life Chapter 5 Dr. Joseph Esdin What Are Cells Made of?
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2 The Basic Unit of Life • Life requires a structural compartment separate from the external environment in which macromolecules can perform unique functions in a relatively constant internal environment • These “living compartments” are cells Robert Hooke • Hooke’s Law: F = -Kx • Most famous for his study of thin slice of cork under the microscope
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3 Robert Hooke • Celluae • The term “cells” Antoni van Leewenhoek • Known as the father of microbiology • Improved the microscope • First to report single celled organisms • animalcules
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4 Cell Theory • Matthias Schleiden observed plant cell and made the first statement of the cell theory • Theodor Shwann reported the same in animal cells Cell Theory • All organisms are composed of cells • Cells are the fundamental units of life • All cells come from preexisting cells
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5 Multicellular Organisms • Division of labor • Cells Must stick together • Cells must communicate with each other Cell Size • Resolution • Unaided eye: • Light Microscopy • Electron Microscopy
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6 What Limits Cell Size? Surface area 4 π r 2 Surface area- to-volume ratio Volume 4/3 π r 3 1 μ m 2 μ m 4 μ m 3.14 μ m 2 6:1 3:1 2:1 12.56 μ m 2 28.26 μ m 2 Spheres 0.52 μ m 3 4.19 μ m 3 14.18 μ m 3 What Limits Cell Size?
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7 Eukaryotes • Membrane-Nucleus • Membrane-organelles • Unicellular/Multicellular • Larger Prokaryotes • Prokaryotes • No nucleus • No membrane- organelles • Unicellular • Smaller
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8 What Functions Are Required to Ensure Cells Survival? • Obtain energy • Express genetic material (proteins synthesis) • Process biochemical reactions • Eliminate waste products Nucleus Rough endoplasmic reticulum Microfilament Lysosome Mitochondrion Centriole Microtubule Ribosomes Exocytotic vesicle Golgi complex Cytosol Endocytotic vesicle Smooth endoplasmic Reticulum Plasma membrane Eukaryotic Cells
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9 Lipid bilayer Intracellular fluid Extracellular fluid Plasma Membrane • Continuous
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This note was uploaded on 06/03/2011 for the course LIFE SCIEN 2 taught by Professor Soliman during the Fall '10 term at UCLA.

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LS 2 Lecture 2 - Life Sciences 2 Cells: The Working Units...

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