Why are steroids able to diffuse across the plasma membrane? a. Their transport protein moves them through the membrane. b. They are amphipathic, allowing them to interact with the entire phospholipid. c. Cells express channels that let hormones flow down their concentration gradient into the cells. d. They are non-polar molecules.

Why are steroids able to diffuse across the plasma membrane? a. Their transport protein moves them through the membrane. b. They are amphipathic, allowing them to interact with the entire phospholipid. c. Cells express channels that let hormones flow down their concentration gradient into the cells. d. They are non-polar molecules.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 18RE

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What is the function of a phosphatase? a. A phosphatase removes phosphorylated amino acids from proteins. b. A phosphatase removes the phosphate group from phosphorylated amino acid residues in a protein. c. A phosphatase phosphorylates serine, threonine, and tyrosine residues. d. A phosphatase degrades second messengers in the cell.
Where do DAG and IP3 originate? a. They are formed by phosphorylation of cAMP. b. They are ligands expressed by signaling cells. c. They are hormones that diffuse through the plasma membrane to stimulate protein production. d. They are the cleavage products of the inositol phospholipid, PIP2.
A hormone signals through a G protein- coupled receptor as shown in the diagram. After the production of IP3, which of these events will MOST quickly stop the transduction of the signal? A. the hydrolysis of IP3 B. the hydrolysis of GTP C. the hydrolysis of PIP2 D. the hydrolysis of the hormone
For cellular transduction, why is it useful that phosphorylation cascades have a series of protein kinases? a. they amplify the original signal b. they always lead to the same cellular response c. the number of molecules used is small and fixed d. they are cell specific
What two steps occur in cell signaling occur AFTER the signal has been detected by a cell surface receptor? a. transduction and inflection b. transduction and amplification c. amplification and termination d. amplification and diversion
A Moving to the next question prevents changes to this answer. Question 1 What is unusual about the receptor for steroid hormones? A. The receptor is located in the cytoplasm but can enter the nucleus once bound to ligand. B. The receptor is embedded in the plasma membrane C. The receptor is located in the cytoplasm but can never enter the nucleus. D. The receptor is located in the lysosome. A Moving to the next question prevents changes to this answer.
A hormone signals through a G protein-coupled receptor as shown in the diagram. After the production of IP3, which of these events will MOST quickly stop the transduction of the signal? A. the hydrolysis of IP3 B. the hydrolysis of GTP C. the hydrolysis of PIP2 D. the hydrolysis of the hormone I believe the answer is (B) the hydrolysisof GTP, because the G protein becomes inactive after GTP is hydrolyzed to GDP. However, the solution provided by Bartleby is (C). Please explain. Thanks
Explain the three stages of cell signaling. a. receptor b. transduction c. response. Attach images
choose one: a. Steroids are hormones processed by their target cells at the plasma membrane b. Steroids are hormones which are able to be dissolved in water c. Steroids are made from cholesterol a type of fat d. Steroids do not use nuclear receptors
How does the function of an intracellular receptor differ from that of a membrane receptor? a. The intracellular receptor binds a ligand. b. The intracellular receptor binds DNA. c. The intracellular receptor activates a kinase. d. The intracellular receptor functions as a second messenger.
Amplification of a chemical signal occurs when? a. phosphorylation of proteins by protein kinase receptors is balanced by the immediate removal of phosphate groups by phosphatases b. a receptor in the plasma membrane activates several “first messenger” molecules while a signal molecule is bound to it c. a cAMP molecule activates one protein kinase molecule before being converted to AMP d. a receptor activates a single first messenger and a single second messenger
What features are remarkable about steroid receptors? (Select all that apply) A. Steroid receptors are localized in the cytoplasm B. steroid receptors are localized in the plasma membrane C. steroid receptors can translocate to the nucleus D. steroid receptors represent the beginning of a signaling Cascade E. steroid receptors can also function as transcription factors