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Slide 4 - Proteins and nucleic acid membranes

Slide 4 - Proteins and nucleic acid membranes - Review...

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Review Proteins, nucleic acids Membranes 2 PRS Clicker quizzes today Spark Quiz #2 is available
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Review 1. Molecular visualization 2. Carbohydrates 1. Subunits = monosaccharides, or simple sugars. Almost always glucose 2. Polymers = polysaccharides Examples: starch, glycogen, cellulose 3. Approx. ratio of atoms: [CH 2 O] Glucose is C 6 H 12 O 6
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3. Lipids 1. An important subunit: fatty acid 2. Polymers Triglycerides (= fats) Functions: energy storage, insulation Also, there are monoglycerides and diglycerides. Phospho-diglycerides (usually called “phospholipids”) Function: membranes
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3. Lipids (continued) 3. Sterols 1. Not polymerized 2. Functions: membrane structure, hormones Lipids are mostly hydrocarbons (= H plus C) Not many polar groups
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Contrast with glucose There are many O-H groups. That explains why sugars are highly soluble in water.
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Fat used for thermal insulation and for energy
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Classes of biomolecules 1. Carbohydrates 2. Lipids 3. Proteins 4. Nucleic acids
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1. Which molecule is the mostly-hydrocarbon subunit found in fat molecules?
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