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MCQs

Total Questions : 191 | Page 14 of 20 pages
Question 131. Cytotoxic T-cells can be recognized by which of the following cell surface marker?
  1.    CD4
  2.    CD7
  3.    CD8
  4.    CD9
 Discuss Question
Answer: Option C. -> CD8
Answer: (c).CD8
Question 132. Chemically an antigen may be
  1.    lipid
  2.    protein
  3.    polysaccharide
  4.    any of these
 Discuss Question
Answer: Option D. -> any of these
Answer: (d).any of these
Question 133. The ability of a competitive inhibitor to bind to an active site in an allosterically controlled enzyme is __________ than the ability of a non-competitive inhibitor to bind to an active site in the same allosterically controlled enzyme.
  1.    greater
  2.    lesser
  3.    approximately equal
  4.    half
 Discuss Question
Answer: Option A. -> greater
Answer: (a).greater
Question 134. Reduction is the
  1.    loss of proton
  2.    gain of electron
  3.    loss of electron
  4.    gain of protons
 Discuss Question
Answer: Option B. -> gain of electron
Answer: (b).gain of electron
Question 135. An endergonic reaction is one that
  1.    requires energy in order to proceed
  2.    releases energy for work
  3.    gives off much heat
  4.    looses energy
 Discuss Question
Answer: Option A. -> requires energy in order to proceed
Answer: (a).requires energy in order to proceed
Question 136. If the Keq for an enzymatic reaction is greater than 1, the reaction
  1.    will be endergonic
  2.    can not occur without the input of energy
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option D. -> none of these
Answer: (d).none of these
Question 137. The ability of FADH to be oxidized is __________ than the ability of FAD to be oxidized.
  1.    greater
  2.    lesser
  3.    approximately equal
  4.    half
 Discuss Question
Answer: Option A. -> greater
Answer: (a).greater
Question 138. The class of immunoglobulins which can cross the placenta is
  1.    IgD
  2.    IgG
  3.    IgA
  4.    IgM
 Discuss Question
Answer: Option B. -> IgG
Question 139. Which of the following mediates Type I hypersensitivity reaction?
  1.    IgE
  2.    IgM
  3.    IgD
  4.    IgG
 Discuss Question
Answer: Option A. -> IgE
Question 140. Self reactive antibodies are not found in significant concentration in normal serum because
  1.    self reactive B cells are killed by CD8 T cells
  2.    it is impossible to generate a self-reactive antibody
  3.    self reactive B cells switch to IgA which is all secreted and not present in serum
  4.    B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide
 Discuss Question
Answer: Option D. -> B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide

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