BILD01Midtermkey - 1A) What biological molecule is present...

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1A) What biological molecule is present in all membranes of the cell? (1word) phospholipids 1B) What makes the membranes of a cell (e.g. the plasma membrane, the mitochondrial membranes, the golgi membranes, etc.) different from one another? (1 short phrase) they contain different proteins 1C) What two functions do all membranes in a cell have in common? (2 short sentences) 1. Membranes serve as barriers between one cellular space and another (or between the outside of the cell and the inside). 2. Membranes are selectively permeable. 2) Name 4 different things that proteins do in cells: enzymes motor proteins (chemical energy converted into movement) cytoskeletal proteins (act as structural elements) transport proteins or channels in membranes package DNA in chromosomes receive signals transduce signals more answers are possible 3) Explain the hydrophobic effect, i.e. the effect that prevents oil from mixing with water (a few sentences and maybe a diagram): Due to the strong electronegativity of oxygen, water is an extremely polar molecule (diagram). The unequal sharing of electrons in the water molecule results in individual water molecules being strongly attracted to one another through hydrogen bonding. Water molecules form a extensive hydrogen bonding network with each other ; this network excludes molecules that do not hydrogen bond or otherwise interact with water (this is the definition of a hydrophobic molecule), causing them to crowd together. 4) Explain how a non-spontaneous reaction can be made to occur inside a cell (one sentence): An enzyme can use the energy released from a spontaneous reaction (exergonic) to drive a non- spontaneous (endergonic) reaction . 5) What is the major energy transfer molecule of a cell? (one word) ATP
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6) This is the overall chemical equation for the oxidation of glucose, whether it occurs inside a cell or on a lab bench by burning glucose: C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O However, when you burn something, you release a lot of heat and light. Why don’t cells burn up when oxidizing glucose – what happens to the energy released? (one sentence)
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This note was uploaded on 08/28/2009 for the course BIO 10 taught by Professor Towb during the Fall '08 term at CSU Northridge.

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BILD01Midtermkey - 1A) What biological molecule is present...

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