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MCQs

Total Questions : 121 | Page 9 of 13 pages
Question 81. Which of the following is a hormone whose action requires a cell surface receptor?
  1.    Adrenaline
  2.    Nitric oxide
  3.    Growth factors
  4.    Progesterone
 Discuss Question
Answer: Option A. -> Adrenaline
Question 82. Two key organizing principles for large multicellular organisms are
  1.    communication between cells and simple nerve reflexes
  2.    prokaryotic cell structure and cell specialization
  3.    cell specialization and communication between cells
  4.    simple nerve reflexes and cell specialization
 Discuss Question
Answer: Option C. -> cell specialization and communication between cells
Question 83. The hormone or ligand can be considered as
  1.    both (a) and (b)
  2.    none of these
  3.    second messenger
  4.    first messenger
 Discuss Question
Answer: Option D. -> first messenger
Question 84. The major second messengers are
  1.    cGMP
  2.    DAG
  3.    cAMP
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 85. The signaling molecules called steroid hormones
  1.    never enter the blood of humans
  2.    are made in one location of the body but have their effects some distance away
  3.    bind to cell surface receptors to trigger chemical cascades
  4.    are hydrophilic and so cannot penetrate the plasma membrane
 Discuss Question
Answer: Option B. -> are made in one location of the body but have their effects some distance away
Question 86.  Small charged molecules, often biogenic amines function as
  1.    hormones
  2.    neurotransmitters
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 87.  SH2 domains specifically bind to
  1.    phosphorylated serine residues
  2.    phosphorylated tyrosine residues
  3.    GDP
  4.    Ca2+
 Discuss Question
Answer: Option B. -> phosphorylated tyrosine residues
Question 88.  
In paracrine signaling, the signaling molecules affects only
  1.    target cells close to the cell from which it was secreted
  2.    target cells distant from its site of synthesis in cells of an endocrine organ
  3.    both (a) and (b)
  4.    none of the above
 Discuss Question
Answer: Option A. -> target cells close to the cell from which it was secreted
Question 89.  Simple nerve reflexes use signaling molecules called
  1.    neurotransmitters
  2.    nitric oxides
  3.    G proteins
  4.    proteases
 Discuss Question
Answer: Option A. -> neurotransmitters
Question 90.  Which of the following is not a type of signaling molecule?
  1.    Testosterone
  2.    Insulin
  3.    Thyroxin
  4.    Adenylate cyclase
 Discuss Question
Answer: Option D. -> Adenylate cyclase

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