7. An amphipathic molecule has: a. Two polar ends b. Two hydrophobic ends. c. A

Question

7. An amphipathic molecule has: a. Two polar ends b. Two hydrophobic ends. c. A hydrophobic and a hydrophilic portion. d. Only one hydrophobic end. e. Only one hydrophilic end. What is a distinguishing feature of most naturally occurring fats? 8. a. They all share four fused rings as a carbon b. Nearly all naturally occurring unsaturated c. Most unsaturated fats have trans double skeleton. fats have cis double bonds. bonds, causing a kink in the hydrocarbon chain wherever they occur. All organisms share an equal ratio of saturated and unsaturated fatty acids. d. e. They are distinguished from other lipid forms by their chief role as components of cell membranes. Lipids differ from other large biological molecules in that they donot contain carbon 9. a. are not truly polymers b. do not have specific shapes c. do not contain nitrogen and phosphorus atoms d. are much larger The lipids that form the main structural component of cell membranes are 10. a. phospholipids b. triacylglycerols c. cholesterol d. carbohydrates e. proteins

Explanation / Answer

7. c.

The prefix 'amphi' means 'both' and an amphipathic molecule is one which has one end hydrophilic(water loving) and the other end as hydrophobic ( water hating). For example, lipid molecule.

8. b.

9. a.

Becuase polymers are molecules with repeating units

10. a.

Cell membranes are made up of three types of lipids-phopholipids, triacylglycerols and cholesterol. Out of these, phospholipids form the major component.

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