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Unformatted text preview: Section- A: , Answer ALL questions (ONE BEST ANSWER) on the scantron l_. All of the following amino acids are nonpolar EXCEPT? alanine” arginine c leucine d) phenylalanine re) valine . . 2. ' Which of the following statements is FALSE? a) triglycerides are used as an energy store b triglycerides help to insulate the body against cold temperatures .. . $5 saturated fatty acids do not pack together as tightly as unsaturated fatty acids )’ cholesterol can affect the fluidity of biological membranes 6) prostaglandins are derivatives of fatty acids ‘ 3. Whicl statement about phospholipids is FALSE? ,aj} are hydrophobic at one end ,b’jlare a major constituent of cell membranes are h ydrophilic at one end ,contain glycerol linked to three fatty acids ,e)/ contain a phosphate group which is hydrophilic 4. Which of the following statements about cholesterol is FALSE? a) is synthesized in the liver/1 . b) is obtained from the diet ‘ high density lipoproteins facilitate the excretion of cholesterol @é a diet rich in unsaturated fatty acids tends to increase cholesterol levels e excessive levels of cholesterol' in blood are a risk faCtor for heart disease _ 5. Which of the folloWing statements about hydrogen bonds is (are) TRUE? a) a hydrogen bond is much weaker than a covalent bond - b) a hydrogen bond links two hydrogen ate/126‘ c hydrogen bonds can link difierent parts of a molecule together both a and c are correct c) all of the above are correct 1 Contains all of the cell‘s DNA is surrounded by two membranes c) messenger RNA is transported out of the nucleus through nuclear pores (1) contains at least one nucleolus e) can be observed with the light microscope 6. [email protected] of the following statements abbut the nucleus of a eukaryotic cell 15 FALSE? ...
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