In class notes for September 3, 2007

In class notes for September 3, 2007 - Introduction to...

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Introduction to Biological Sciences 110a In class notes for September 3, 2007 Discussion session today at 5:10 pm in lecture hall. The topic is Biology in Perspective . First help session is tomorrow at 4:10 in lecture hall. Cell contents o 70 to 75% of composition is water o The rest is primarily composed of macromolecules o Karp Fig. 1-11 o All macromolecules are made of small molecules called precursors strung together o Precursors condense to form macromolecules (they undergo a condensation reaction, which means water is removed) o R 1 -H+R 2 -OH R 1 R 2 +H 2 O is a condensation reaction o Condensation requires energy Classes of macromolecules o Proteins Largest class by weight Polymers of amino acids Precursors are amino acids Pretty much everything an organism does is done by proteins Very diverse in functions and structures Functions Structural e.g. Collagen (in bone, connective tissue, skin) Catalytic (enzymes) o Accelerates chemical reactions o e.g carboxypeptidase (digestive enzyme in intestines)
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Introduction to Biological Sciences 110a In class notes for September 3, 2007 Transport other molecules o e.g. hemoglobin o Carries oxygen in blood o Some carry molecules across cell membranes Signaling molecules o Hormones (not all are proteins) o Bind to other molecule, causing a response o Insulin Signal recognition o Binding molecule can be a protein
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In class notes for September 3, 2007 - Introduction to...

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