Recitation Questions - 9-11-07

Recitation Questions - 9-11-07 - Recitation 09/11/07...

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Recitation 09/11/07 – Molecules of Life, Membranes, and Cells 1) How is lactose similar to sucrose (structure, function)? How are they different (structure, occurrence, function)? ( pg. 38) Similarities : Structural similarities : The left circular carbon chain is identical for both sucrose and lactose. Functional similarities : Sucrose and lactose are both sugars and they both are used for as a form of energy They are both glucose transporters – transport sugars Both linked by covalent bonds Differences : * Structure: Sucrose has a different carbon chain than lactose: a pentagon shape instead of a hexagon. Two different isomers of glucose * Function: - Sucrose is the form of sugar in which most humans and other animals eat. - Lactose is the form of sugar in which many mammals supply energy to their young, not for themselves. Adults have greatly reduced levels of lactase, the enzyme required to cleave lactose into its two monosaccharide components. Most of the energy that is channeled into lactose production is therefore reserved for offspring
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2) Palm oil is solid at room temperature whereas canola oil is liquid. a) Which of the two has likely a higher content of saturated fatty acids? (pg. 55) Palm oil, unlike most plant oils, is saturated despite its fluidity at room temperature. An oil may be converted into a solid fat by chemically adding hydrogen. Peanut butter sold in stores is usually artificially hydrogenated to make the peanut fats solidify, preventing them from separating out as oils while the jar sits on the store shelf. The hydrogenation reaction produces trans-fatty acids that increase the level of cholesterol carried in blood. b) Why might cool-weather plants like canola preferentially produce more unsaturated fatty
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This note was uploaded on 04/15/2008 for the course BIO 220 taught by Professor Cassiemajetic during the Fall '07 term at Allegheny.

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Recitation Questions - 9-11-07 - Recitation 09/11/07...

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