You learn that your “new” discovered hormone activates phospholipase C. Based on this, which one of the following changes is most likely to occur following hormone administration? a. Intracellular DAG levels will increase b. Cytosolic Ca concentrations will decrease c. Ca association with calmodulin will decrease d. Phosphorylation of protein tyrosine residues will increase e. None of the above

You learn that your “new” discovered hormone activates phospholipase C. Based on this, which one of the following changes is most likely to occur following hormone administration? a. Intracellular DAG levels will increase b. Cytosolic Ca concentrations will decrease c. Ca association with calmodulin will decrease d. Phosphorylation of protein tyrosine residues will increase e. None of the above

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter49: Endocrine Regulation

Section: Chapter Questions

Problem 1TYU: A cell secretes a product that diffuses through the interstitial fluid and acts on nearby cells....

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You learn that your “new” discovered hormone activates phospholipase C. Based on this, which one of the following changes is most likely to occur following hormone administration? a. Intracellular DAG levels will increase b. Cytosolic Ca concentrations will decrease c. Ca association with calmodulin will decrease d. Phosphorylation of protein tyrosine residues will increase e. None of the above Factors known to increase ACTH secretion include all of the following except: a. stress b. ADH c. Hyperglycemia d. CRH e. a and b
Endocrine downregulation ... a) ... occurs in target cells that respond to hormones that are present in constant amounts in the blood. b) ... leads to the increased sensitivity of the target organ to the hormone. c) ... leads to a decrease in the number of receptors in the target cell. d)... occurs in part due to increased receptor synthesis in the target cell.
When a catecholamine or peptide hormone binds to receptors on the surface of a cell, A. The hormone is transported to the nucleus where it alters the activity of dna. B. The cell membrane becomes less permeable. C. The cell becomes inactive. D. A second messenger appears in the cytoplasm.
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
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
Which of the following observations can be explained by the properties of hormone receptors? a) A certain tissue can react to more than one hormone b) A certain hormone affects only a specific tissue, not all tissues c) Some tissues react very quickly to a certain hormone, other tissues take many hours to react to the same hormone
A new antagonist molecule has been discovered that binds to and blocks plasma membrane receptors. What effect will this antagonist have on testosterone, a steroid hormone? a. It will block testosterone from binding to its receptor. b. It will block testosterone from activating cAMP signaling. c. It will increase testosterone-mediated signaling. d. It will not affect testosterone-mediated signaling.
How does the binding of a hormone to a receptor activate a G-protein? a. It replaces bound GDP with GTP. b. It’s magic. c. It replaces bound GTP for GDP. d. A and B. e. None of the above.
Which one of the following hormones does not have intracellular receptors? a. Estrogens b. Cortisol c. Insulin d. Epinephrine e. T3 Gs proteins serve as transducers in the action of: a. Testosterone b. PRL c. GH d. TSH
Which of the following occurs by active transport A)transport of Na+ from region of higher concentration through a region of lower concentration through a channel B) simple didfussion of a steroid hormone through the plasma memebrane C) Faciltated diffusion of Cl- down it's concentration gradient D) Transport of K+ across the plasma memebrane using cellular ATP
An increase in epinephrine results in: a. An increase activity of insulin. b. An increased activity of protein kinase A. c. A decreased level of cAMP. d. An increase activity of protein phosphatase.
Why does epinephrine bind its receptor in a different location than cortisol binds its receptor? A. The receptor binding site of epinephrine must be extracellular because the cell’s membrane is a barrier that prevents epinephrine from reaching any intracellular binding sites. B. The membrane blocks cortisol from entering the cell, therefore cortisol must bind the receptor on the cell’s extracellular surface. C. Cortisol easily passes through the cell’s plasma membrane. Therefore, the cortisol receptor is found intracellularly. D. Epinephrine can dissolve across the plasma membrane and bind its intracellular receptor. E. Both A&C F. Both B&D