LS1Molecular_Components

LS1Molecular_Components - Life Science 3 Introduction of...

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Unformatted text preview: Life Science 3 Introduction of Molecular Biology Molecular biology seeks to understand the physical and chemical basis of life . Why study molecular biology? Growth Division Specialization Movement Interactions It is estimated that the number of described species on earth Is approximately 1.75 million (total may up to 100 million). Bacteria Yeast C. Elegans Drosophila Plants Mouse Cell: the Basic Unit Of Living Organisms Xenopus Exception:Viruses Exception:Viruses Genetic information plus protective covering. Genetic information plus protective covering. Parasite: dependent on host for proteins and Parasite: dependent on host for proteins and energy. energy. Viruses may infect bacteria (bacteriophages), Viruses may infect bacteria (bacteriophages), plants (plant viruses) or animals (animal plants (plant viruses) or animals (animal viruses). viruses). Prokaryotic Cell Eukaryotic Cell All cells are made up of the same kinds of macromolecules. DNA - D eoxyribon ucleic a cid, stores information as genes RNA - R ibon ucleic a cid, used for information transfer from DNA gene to protein Protein -functional molecules involved in all cellular processes Also Lipids and Polysacharrides Macromolecules Components of Living Matter Atoms Six most popular atoms in living systems: H ydrogen, C arbon, N itrogen, P hosphorus, O xygen, and S ulfur ??...
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This note was uploaded on 03/14/2012 for the course LS 3 taught by Professor Lin during the Fall '06 term at UCLA.

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LS1Molecular_Components - Life Science 3 Introduction of...

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