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1.II:. Intro to Biochemistry

  • Page ID
    7274
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    A. What is biochemistry and who needs it?

    Literally "Biochemistry" is the chemistry of life. This is synonymous with "Molecular Biology", but traditionally biochemistry has dealt more with the study of proteins and smaller biomolecules and molecular biology has dealt more with gene expression and associated molecules. The two are often used together now as in the major at U. C. Davis, "Biochemistry and Molecular Biology". Because biomolecules are the underlying basis for all aspects of the physiology and behavior of living systems, anyone who chooses to work in a biologically-related field has a need for an understanding of biochemistry.

    B. Molecules in an E. coli cell

    Compound % weight ave. MW #/cell # of kinds comment
    \(H_2O\) 70 18 \(4\times 10^{10}\) 1
    Ions (Na,K,SO4, etc.) 1 40 \(2.6 \times 10^8\) 20 major exampleNa+ ~0.050 M
    Carbohydrates 3 150 \(2 \times 10^8\) 250
    Amino Acids 0.4 120 \(3 \times 10^7\) 20 main ~120 total
    Nucleotides 0.4 300 \(1.2 \times 10^7\) 5 main ~100 total
    Lipids 2 750 \(2.5 \times 10^7\) 50
    Proteins 15 40,000 \(1 \times 10^6\) 4,288 35 -85,000 in humans!
    RNA 6 \(10^6\) \(2 \times 10^4\) ~2,000 35 -85,000 in humans
    DNA 1 \(2.5 \times 10^9\) \(1\, (4)\) 1 46 @ 5 \times 10^10 (human)

    1.II:. Intro to Biochemistry is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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