mixture answer

mixture answer - SID_Name_ Choose the one alternative that...

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SID_________________________Name__________________ Choose the one alternative that best completes the statement or answers the question. (80%) 1( )Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits. Which of the following is an exception to this statement? A)a steroid B)a contractile protein C)DNA D)an enzyme E)cellulose 2( )The R group or side chain of the amino acid serine is —CH 2 —OH. The R group or side chain of the amino acid alanine is —CH 3 . Where would you expect to find these amino acids in a globular protein in aqueous solution? A)Alanine would be in the interior, and serine would be on the exterior of the globular protein. B)Both serine and alanine would be in the interior of the globular protein. C)Both serine and alanine would be on the exterior of the globular protein. D)Serine would be in the interior, and alanine would be on the exterior of the globular protein. E)Both serine and alanine would be in the interior and on the exterior of the globular protein. 3( )If a modern electron microscope (TEM) can resolve biological images to the nanometer level, as opposed to the best light microscope, this is due to which of the following? A)The electron microscope cannot image whole cells at one time. B)Electron beams have much shorter wavelengths than visible light. C)Contrast is enhanced by staining with atoms of heavy metal. D)The electron microscope has much greater ratio of image size to real size. E)The focal length of the electron microscope is significantly longer. 4( )An animal cell lacking oligosaccharides on the external surface of its plasma membrane would likely be impaired in which function? A)cell-cell recognition B)transporting ions against an electrochemical gradient C)maintaining fluidity of the phospholipid bilayer D)establishing the diffusion barrier to charged molecules E)attaching to the cytoskeleton 1
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Use the following information to answer the questions 5: Cystic fibrosis is a genetic disease in humans in which chloride ion channels in cell membranes are missing or nonfunctional. 5( )Which of the following would you expect to be a problem for someone with nonfunctional chloride channeling? A)buildup of excessive secretions in glands such as the pancreas B)mental retardation due to low salt levels in brain tissue C)buildup of excessive secretions in organs such as lungs D)inadequate secretion of mucus E)sweat that includes no NaCl 6( )Increasing the substrate concentration in an enzymatic reaction could overcome which of the following? A)saturation of the enzyme activity B)insufficient cofactors C)denaturization of the enzyme D)competitive inhibition E)allosteric inhibition 7( )Which kind of metabolic poison would most directly interfere with glycolysis? A)an agent that closely mimics the structure of glucose but is not metabolized
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This note was uploaded on 11/07/2009 for the course BIO 066.6 taught by Professor Darby during the Spring '09 term at Sierra.

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mixture answer - SID_Name_ Choose the one alternative that...

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