Lecture 02-1

Lecture 02-1 - BSCI 124: LECTURE 2 The Cell Lifes...

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BSCI 124: LECTURE 2 – The Cell Life’s molecules: Carbohydrates Lipids Proteins Nucleic acids What is a cell? The Cell Theory Cell components: cell wall, organelles Endosymbiont Theory
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Cell Macromolecules: The Molecules of Life The cell is made of the following four biologically important molecules: _______________ (sugars, starches, cellulose) ______ (fats, oils, waxes, phospholipids, steroids) Proteins (composed of amino acids) Nucleic Acids (_____________________)
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Life’s molecules All life’s molecules share the following four characteristics: 1. C___________-based 2. Formed from a few elements: _____________ 3. Modular construction (like bricks, cheap and easy to build small building blocks) 4. Their function depends on _____________ (or, structure/shape determines function)
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Why should we learn about life’s molecules? Because we eat them everyday! We are composed of these bio-molecules
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1. C__________________ Organic molecules composed of C, H, O (1:2:1 ratio) Most abundant of life’s molecules
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Carbohydrates There are three types of carbohydrates: ______- saccharides (one) ______- saccharides (two) ______- saccharides (many) _________saccharides (simple sugars of 3 to 6 carbons) • Glucose C 6 H 12 O 6 (‘blood sugar’) • Fructose C 6 H 12 O 6 (fruit) • Ribose C 5 H 10 O 5 (nucleic acids)
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Carbohydrates _____saccharides Composed of two monosaccharides. Sucrose (table sugar) C 12 H 22 O 11 Glucose + Fructose = Sucrose + water
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Carbohydrates ____saccharides (many) – long chains of monosacch. S______ – energy storage C___________ – plant cell walls (wood, paper, cloth)
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Function of Carbohydrates Energy _____________ (in the C-H bonds) For structure in plants (cellulose for cell wall) Carbon sources to make other molecules (nucleic acids, amino acids)
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2. L__________ Composed of C, O, H atoms Fats and oils are made from two building blocks: Glycerol molecule Fatty Acids
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Lipids Fats are solid lipids at room temperature (usually animal-derived: lard, butter) Oils are liquid lipids (usually plant-derived: corn oil, peanut oil, olive oil)
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Lecture 02-1 - BSCI 124: LECTURE 2 The Cell Lifes...

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