LS1Molecular Components

LS1Molecular Components - Life Science 3 Introduction of...

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1 Life Science 3 Introduction of Molecular Biology Molecular biology seeks to understand the physical and chemical basis of life . Why study molecular biology? •G r ow t h • Division • Specialization • Movement • Interactions
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2 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
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3 • 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 ( Viruses may infect bacteria ( bacteriophages bacteriophages ), ), plants (plant viruses) or animals (animal viruses). Prokaryotic Cell
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4 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
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5 Macromolecules Components of Living Matter
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6 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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7 Biomolecules, cells, and organisms Chemical bonds
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LS1Molecular Components - Life Science 3 Introduction of...

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