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Alexus [3.1K]
4 years ago
14

Beta-adrenergic receptor signaling must be terminated quickly or an extended metabolic shift could cause serious problems for th

e organism. Which best explains how receptors are "desensitized"?A. G proteins will lead to activation of proteases, which reduces the overall amount of receptor on the cell membrane.B. Arrestin will first bind the receptor, allowing G protein-coupled receptor kinase to recognize the GPCR and phosphorylate the receptor. This increases the GTPase activity of the G protein.C. G protein-coupled receptor kinases (GRKs) are protein kinases that phosphorylate receptors for internalization.D. G protein-coupled receptor kinases (GRKs) lead to the activation of other protein kinases, which block ligand binding to the receptor binding pocket.
Biology
1 answer:
Andreas93 [3]4 years ago
5 0

Answer:B

Explanation:

Agonist-induced desensitization involves phosphorylation of G protein-coupled receptors by two currently recognized classes of serine/threonine protein kinases. Second messenger-dependent kinases, phosphorylating a variety of proteins, mediate a generalized cellular hyporesponsiveness termed heterologous desensitization. G protein-coupled receptor kinases (GRKs) phosphorylate specifically agonist-occupied, or activated, receptors, and thereby initiate receptor-specific, or homologous, desensitization.

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4 years ago
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Ecosystems change when _______. a. living components of an ecosystem change b. nonliving components of an ecosystem change c. th
ICE Princess25 [194]

Ecosystems change when all of the above components listed change ie, living components of an ecosystem, nonliving components of an ecosystem, or their stability is disrupted.

Hence correct option is D.

  • A community of creatures and their physical environment make up an ecosystem.
  • Ecosystems can be terrestrial, aquatic, or marine and come in a variety of sizes.
  • The term "biome" refers to broad classifications of terrestrial ecosystems. Ecosystems, the dynamic network of living and nonliving things in a place, change gradually over time.
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  • If the living components i.e., flora and fauna of the ecosystem change then there will be increase or decrease in food availability and either surge in predators or no predators at all. hence it will greatly affect the ecosystem.
  • non living components such as temperature, water availability, natural calamities can also affect the ecosystem. it can lead to extinction or migration from one place while influx of immigration to another.
  • if the stability of ecosystem is disrupted due to change in living and non living components then also the ecosystem will be affected.

hence all of the above options are correct.

learn more about Ecosystems here:brainly.com/question/842527

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4 0
2 years ago
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sweet-ann [11.9K]

Answer:

D

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