Biochemistry - Mock Test 30

Question 291

Which second messenger signals the release of Ca+2 from endoplasmic reticulum

A) IP3 B) 1,2 diacyl glycerol C) cAMP D) cGMP

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Question 292

Which of the following serves as a neurotransmitter in adrenergic neurons?

A) Serotonin B) Epinephrine C) Dopamine D) Histamine

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Question 293

A hormone or ligand can be considered as

A) First messenger B) Second messenger C) Third messenger D) Fourth messenger

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Question 294

The binding of ligands to many GPCRs leads to

A) Decrease in concentration of certain intracellular signal molecules called second messengers B) Increase in concentration of certain intracellular signal molecules called second messengers C) Decrease in concentration of certain extracellular signal molecules called first messengers D) Increase in concentration of certain extracellular signal molecules called first messengers

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Question 295

Which of the following catalyzes the cutting of PIP2 into 2 moles of IP3 and diacylglycerol in cell signaling

A) Phosphokinase C B) Phospholipase C C) Lipokinase D) Phosphodiesterase C

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Question 296

Which out of the following is not involved in signal transduction by β-adrenergic receptor pathway

A) GTP B) ATP C) cAMP D) cGMP

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Question 297

Protein kinase A is

A) Completely inhibited by cyclic AMP B) Allosterically activated by cyclic AMP C) Affected by cyclic AMP only under unusual circumstances D) Activated by covalent binding of cyclic AMP

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Question 298

Which of the following is not a G-protein coupled receptor

A) Glycine receptor B) Adrenergic receptor C) Glutamate receptor D) Muscarinic receptor

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Question 299

Which out of the following statements is true about G-protein couple receptors

A) The N-terminal chain is extracellular and C-terminal chain is intracellular B) It contains 5 trans-membrane hydrophobic sections C) There are more extracellular loops than intracellular loops D) The binding region for G-protein involves 2 extracellular loops

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Question 300

Alpha particles are _______

A) twice the mass of beta particles B) negatively charged C) just like helium nuclei D) lower in ionizing power as compared to gamma rays

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