Respuesta :
In the marine mollusk, aplysia, serotonin binds to a g-protein-coupled receptor and activates a gs sub-unit. The resulting activation of PKA leads to phosphorylation and closure of k channels. This results in decreased K+ efflux, depolarizing the cell.
A tremendously diversified group of animals, Mollusca (or mollusks), has at least 85,000 different species that are still alive. With around 23% of all known marine species, mollusks are the largest marine phylum. Clams, scallops, oysters, mussels, limpets, chitons, and snails are all examples of mollusks; snails are gastropods and makeup around 80% of the species of invertebrate. Mollusks known as cephalopods include nautilus, squid, cuttlefish, and octopuses.
Some features of mollusks are:
- All mollusks have soft, unsegmented bodies with "head" and "foot" regions.
- They have hard exoskeletons covering their bodies, such as the plates of chitons or the shells of snails and clams
- Many have calcareous or protein- and chitin-based shells
- The majority of mollusks have eyes
- The mantle of mollusks has a body cavity (used for breathing and excretion) and a radula (something tongue-like).
- All mollusk eggs hatch into larvae or tiny adults
- All mollusk larvae have neurological systems, circulatory systems, and frequently complicated digestive systems.
One of the main kinds of cell surface receptors, G protein-coupled receptors (GPCRs), are connected to a family of G proteins made up of the alpha, beta, and gamma subunits.
Learn more about mollusks and g-protein-coupled receptors here: https://brainly.com/question/14960132
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