Note that they can have more than one answer and I need to provide all the corre

Question

Note that they can have more than one answer and I need to provide all the correct answers. 7 At which of the following steps in a signaling pathway can amplification of the signal occur? A. An extracellular signal molecule binds and activates a cell-surface receptor. B. An activated G protein activates adeny late cyclase, the enzyme that C) Adenylate cyclase produces cyclic AMP molecwles of eylic AP, his then AMP ?it converisire. Aip into multiple PCyclic AMP activates a protein kinase (A-kinase), activates PKA E. A-kinase phosphorylates target proteins 8. When a trimeric G protein is activated by a cell-surface receptor: A. the B subunit exchanges its bound GDP for GTP B the GDP bound to the a subunit is phosphorylated to form bound GTP C. it dissociates into a free B subunit and an ay subunit. the a subunit exchanges its bound GDP for GTF. it dissociates into an active ? subunit and in inactive ?? subunit. 9. What properties of intermediate filaments monomers distinguish them from the monomers that make up actin filaments or microtubules? A. They bind to each other covalently B. They are fibrous rather than globular proteins. C. They do not bind and hydrolyze nucleotides. D. There are numerous different types in different cell types. E. They are glycosylated.

Explanation / Answer

Ans 7 : c) Adenylate cyclase produces cyclic AMP.

Adenylate cyclase produces cyclic AMP which is an important second messenger. It is produced from the ATP molecules , which then activates the protein kinase A.

This is used in intracellular signalling pathway in cAMP dependent pathway.

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