41. The activity of protein kinase A is affected by which of the following? I. caffeine II. levels of cAMP III. phosphodiesterases IV. cholera toxin A) I only B) II only C) I, IV D) I, II, III E) I, II, III, IV

levels of cAMP

Explanation:

protein kinase A  enzyme is also called as A kinass or the cyclic AMP-dependent protein kinase. It is an enzyme that covalently links aor adds proteins with phosphate groups. The activity of this enzyme is regulated by varying levels of cyclic AMP within cells, because of this the enzyme is also called as the cyclic AMP-dependent protein kinase.

d

explanation:

the higher the instrument the better

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure