Which of the following is incorrect about pathways activated...

Name: Problem 6, Chapter 9: Biology: The Dynamic Science
Uploaded: 2021-09-22T06:39:19-08:00
Duration: 52 s
Channel: Josee Pacheco
Description: Which of the following is incorrect about pathways activated by G-protein-coupled receptors? a. The extracellular signaling molecule is the first messenger. b. When activated, plasma membrane-bound G protein can switch on an effector. c. Second messengers enter the nucleus. d. ATP converts to cAMP to activate protein kinases. e. Protein kinases phosphorylate molecules to change cellular activity.

Which of the following is incorrect about pathways activated by G-protein-coupled receptors? a. The extracellular signaling molecule is the first messenger. b. When activated, plasma membrane-bound G protein can switch on an effector. c. Second messengers enter the nucleus. d. ATP converts to cAMP to activate protein kinases. e. Protein kinases phosphorylate molecules to change cellular activity.

Which of the following is incorrect about pathways activated by G-protein-coupled receptors?
a. The extracellular signaling molecule is the first messenger.
b. When activated, plasma membrane-bound G protein can switch on an effector.
c. Second messengers enter the nucleus.
d. ATP converts to cAMP to activate protein kinases.
e. Protein kinases phosphorylate molecules to change cellular activity.

Key Concepts

Protein Kinases and Phosphorylation

Protein kinases are enzymes that mediate cellular responses by adding phosphate groups from ATP to specific substrate proteins, a process known as phosphorylation. This modification can alter the function, activity, or localization of target proteins, thereby modulating cellular activity.

Second Messengers

Second messengers are small intracellular molecules, such as cAMP, that propagate the signal initiated by the extracellular ligand. They amplify and distribute the signal within the cell, typically acting locally to activate downstream targets and not by entering the nucleus.

G Proteins and Effector Activation

G proteins serve as molecular switches that propagate the signal from activated GPCRs to downstream effectors. Once activated, these proteins can interact with various effector enzymes, such as adenylyl cyclase, which then produce second messengers to continue the signaling process.

G-Protein-Coupled Receptors (GPCRs)

GPCRs are integral membrane proteins that detect extracellular signals and initiate intracellular responses. When a ligand, or first messenger, binds to a GPCR, it triggers a conformational change in the receptor that activates associated G proteins, driving the signal transduction cascade inside the cell.

First Messengers

First messengers refer to extracellular signaling molecules, such as hormones or neurotransmitters, that bind to cell surface receptors like GPCRs. Their binding initiates cellular responses by activating intracellular signaling cascades.

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