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Home⇒ Medical Science⇒ Biochemistry⇒ Cell signalling and transduction
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ Self-phosphorylation is an excellent mechanism for triggering specific catalytic function of the proteins involved in signal cascades because it changes the shape and thus the enzymatic activity of the proteins involved [other wrong options] [Discuss in forum] ![]() ![]() makes the receptor more likely to capture the signaling, molecule allows hydrophilic signaling molecules to cross the plasma membrane None of the above |
Q2 ⇒ In terms of cell communication, what do bacterial pathogens such as cholera and anthrax have in common? They block the normal functioning of signal transduction mechanisms [other wrong options] [Discuss in forum] ![]() ![]() They destroy the receptors for key signaling molecules They prevent the production of key signaling molecules They alter the chemical structure of key signaling molecules |
Q3 ⇒ Which of the following processes involve the combining of a message from one signaling molecule with that of another to either enhance or inhibit a cellular effect? Signal integration [other wrong options] [Discuss in forum] ![]() ![]() Signal transduction Signal reception Signal amplification |
Q4 ⇒ Simple nerve reflexes use signaling molecules called neurotransmitters [other wrong options] [Discuss in forum] ![]() ![]() nitric oxides G proteins proteases |
Q5 ⇒ Nitroglycerin has long been administered to human patients suffering from chronic chest pain (angina). This medication works because it breaks down into nitric oxide, which increases blood flow to the heart [other wrong options] [Discuss in forum] ![]() ![]() mimics the action of signal receptors is broken down into hormones that affect the heart interferes with chemical cascades that trigger contraction of heart muscle |
Q6 ⇒ The enzyme that catalyzes the splitting of PIP2 into two molecules of inositol triphosphate (IP3) and diacylglycerol in cell signaling, is phospholipase C [other wrong options] [Discuss in forum] ![]() ![]() phosphokinase C phosphodiesterase C lipokinase |
Q7 ⇒ The major second messengers are All of these [other wrong options] [Discuss in forum] ![]() ![]() cAMP cGMP DAG |
Q8 ⇒ Small charged molecules, often biogenic amines function as both (a) and (b) [other wrong options] [Discuss in forum] ![]() ![]() hormones neurotransmitters none of these |
Q9 ⇒ Which of the following comes under the category of cell surface receptor? All of these [other wrong options] [Discuss in forum] ![]() ![]() Enzyme linked receptors Ion-channel linked receptors G protein linked receptors |
Q10 ⇒ Which of the following statement is correct? Cell communicate with one another in multicellular organisms using extracellular signaling molecules or hormones [other wrong options] [Discuss in forum] ![]() ![]() Cell communicate with one another in unicellular organisms using extracellular signaling antigen and antibody Cell communicate with one another in multicellular organisms using intracellular signaling molecules only Cell communicate with one another in unicellular organisms using intracellular signaling antigen and antibody |
Q11 ⇒ Two key organizing principles for large multicellular organisms are cell specialization and communication between cells [other wrong options] [Discuss in forum] ![]() ![]() prokaryotic cell structure and cell specialization communication between cells and simple nerve reflexes simple nerve reflexes and cell specialization |
Q12 ⇒ Which of the following is not a type of signaling molecule? Adenylate cyclase [other wrong options] [Discuss in forum] ![]() ![]() Testosterone Insulin Thyroxin |
Q13 ⇒ If a disease of the blood vessels caused the endothelial cells of the vessel to die, what effect would that have on the cellular activities associated with vasodilation? All of the above [other wrong options] [Discuss in forum] ![]() ![]() Nitric oxide would no longer be produced Smooth muscle cells could not be made to relax It would be more difficult to increase blood flow and reduce blood pressure |
Q14 ⇒ The binding of ligands to many G-proteins linked receptors leads to shortlived increase in the concentration of certain intracellular signaling molecules called second messenger [other wrong options] [Discuss in forum] ![]() ![]() decrease in the concentration of certain intracellular signaling molecules called second messenger increase in the concentration of certain extracellular signaling molecules called first messenger decrease in the concentration of certain extracellular signaling molecules called first messenger |
Q15 ⇒ The signaling molecules called steroid hormones are made in one location of the body but have their effects some distance away [other wrong options] [Discuss in forum] ![]() ![]() are hydrophilic and so cannot penetrate the plasma membrane bind to cell surface receptors to trigger chemical cascades never enter the blood of humans |
Q16 ⇒ When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ . signaling molecule; target cell; receptors [other wrong options] [Discuss in forum] ![]() ![]() signaling molecule; receptor; G proteins signaling molecule; target cell; G proteins kinase; receptor; proteases |
Q17 ⇒ In the signal transduction mechanism known as protein phosphorylation All of the above [other wrong options] [Discuss in forum] ![]() ![]() the signaling molecule binds to a surface receptor receptor kinases play a key role in triggering the signal cascade phosphorylated proteins act with enzymes to trigger the signal cascade |
Q18 ⇒ Which of the following is a second messenger? Both (a) and (b) [other wrong options] [Discuss in forum] ![]() ![]() lnositol 1,4,5-triphosphate Diacyl glycerol Phospholipase C |
Q19 ⇒ In paracrine signaling, the signaling molecules affects only target cells close to the cell from which it was secreted [other wrong options] [Discuss in forum] ![]() ![]() target cells distant from its site of synthesis in cells of an endocrine organ both (a) and (b) none of the above |
Q20 ⇒ cAMP and cGMP are derived from ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively [other wrong options] [Discuss in forum] ![]() ![]() GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively none of the above |
Or |