Question: Simple nerve reflexes use signaling molecules called [A]. neurotransmitters [B]. nitric oxides [C]. G proteins [D]. proteases Answer: Option A Explanation: No answer description available for this question.

Question: Two key organizing principles for large multicellular organisms are [A]. prokaryotic cell structure and cell specialization [B]. cell specialization and communication between cells [C]. communication between cells and simple nerve reflexes [D]. simple nerve reflexes and cell specialization Answer:…

Question: cAMP and cGMP are derived from [A]. ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively [B]. GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively [C]. ATP and GTP by…

Question: The major second messengers are [A]. cAMP [B]. cGMP [C]. DAG [D]. All of these Answer: Option D Explanation: No answer description available for this question.

Question: The binding of ligands to many G-proteins linked receptors leads to shortlived [A]. increase in the concentration of certain intracellular signaling molecules called second messenger [B]. decrease in the concentration of certain intracellular signaling molecules called second messenger [C].…

Question: The hormone or ligand can be considered as [A]. first messenger [B]. second messenger [C]. both (a) and (b) [D]. none of these Answer: Option A Explanation: No answer description available for this question.

Question: Which of the following comes under the category of cell surface receptor? [A]. Enzyme linked receptors [B]. Ion-channel linked receptors [C]. G protein linked receptors [D]. All of these Answer: Option D Explanation: No answer description available for this…

Question: Small charged molecules, often biogenic amines function as [A]. hormones [B]. neurotransmitters [C]. both (a) and (b) [D]. none of these Answer: Option C Explanation: No answer description available for this question.

Question: The enzyme that catalyzes the splitting of PIP2 into two molecules of inositol triphosphate (IP3) and diacylglycerol in cell signaling, is [A]. phosphokinase C [B]. phospholipase C [C]. phosphodiesterase C [D]. lipokinase Answer: Option B Explanation: No answer description…

Question: Which of the following statement is incorrect? [A]. The principal lipophilic hormones that binds to receptors located in the plasma membranes are prostaglandins [B]. Prostaglandins are synthesized from arachidonic acid [C]. Prostaglandins act as paracrine signaling molecules [D]. None…