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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. |
Q21 ⇒ A cell is known to respond to a particular signaling molecule. Which of the following must be true of this cell? It contains the receptor for the signaling molecule [other wrong options] [Discuss in forum] It is in the heart muscle It is also the site of production for the signaling molecule It is incapable of signal transduction |
Q22 ⇒ The hormone or ligand can be considered as first messenger [other wrong options] [Discuss in forum] second messenger both (a) and (b) none of these |
Q23 ⇒ Which of the following statements about G proteins is false? They become activated when bound to GDP [other wrong options] [Discuss in forum] They are involved in signal cascades They bind to and are regulated by guanine nucleotides They must be active before the cell can make needed cAMP |
Q24 ⇒ What is the name of the protein signaling molecule that alters glucose uptake, and where would its receptors be located? Insulin; many different cell types that use glucose for fuel [other wrong options] [Discuss in forum] Insulin; beta cells of the pancreas PDGF; the blood NGF; the nerves involved in simple reflexes |
Q25 ⇒ A signal cascade induced by adrenaline or thyroxine all of the above [other wrong options] [Discuss in forum] must begin with receipt of the signal molecule by a surface receptor involves the activation of a G protein results in the activation of a sequence of enzymes needed for the cell effect |
Q26 ⇒ SH2 domains specifically bind to phosphorylated tyrosine residues [other wrong options] [Discuss in forum] phosphorylated serine residues GDP Ca2+ |
Q27 ⇒ Which of the following is true about a hydrophilic signaling molecule? It might trigger a signal cascade that causes some effect in a cell [other wrong options] [Discuss in forum] Its receptor is located in the cytosol of the target cell Since it can enter the cell, it directly affects some specific cell process It is a steroid |
Q28 ⇒ In vasodilation, proper nerve signals sent to blood vessels cause All of the above [other wrong options] [Discuss in forum] the release of nitric oxide from endothelial cells relaxation of smooth muscle cells reduced blood pressure |
Q29 ⇒ Which of the following is a hormone whose action requires a cell surface receptor? Adrenaline [other wrong options] [Discuss in forum] Nitric oxide Progesterone Growth factors |
Q30 ⇒ Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*? Because nitric oxide breaks down quickly and thus cannot travel far [other wrong options] [Discuss in forum] Because other body tissues use a different signaling molecule Because nitric oxide cannot cross cell membranes and enter the blood None of the above |
Q31 ⇒ Cell signaling can be classified into three distinct types based on the distance over which the signaling molecules act [other wrong options] [Discuss in forum] two distinct types based on the distance over which the signaling molecules act three distinct types based on the signaling molecules none of the above |
Q32 ⇒ Which of the following statement is incorrect? None of the above [other wrong options] [Discuss in forum] The principal lipophilic hormones that binds to receptors located in the plasma membranes are prostaglandins Prostaglandins are synthesized from arachidonic acid Prostaglandins act as paracrine signaling molecules |
Or |