Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 11, Problem 7TYK
Summary Introduction
Introduction: G proteins are bound to GPCR (G protein-coupled receptors) that are essential for triggering many signal transduction pathways. The G protein is a heterotrimer having three sub units, namely α, β, and γ. The α sub unit is responsible for activating many cascade reactions in the effector cells by the process of phosphorylation, while β and γ sub units dissociate and activate its target cells.
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Students have asked these similar questions
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
The activation of receptor tyrosine kinases is characterized by
a.
dimerization and phosphorylation
b.
a phosphorylation cascade
c.
channel protein shape change
d.
GTP hydrolysis
Consider this pathway: epinephrine --> receptor -->G-protein---> Adenyl Cyclase---> cAMP --> protein kinase --> transcription factors. Identify the effector.
A.
cAMP
B.
G protein-coupled receptor
C.
epinephrine
D.
adenyl cyclase
Which statement is not true about G proteins?
A.
They are integral membrane proteins.
B.
They are slowly inactivated by their own GTPase activity.
C.
They are multisubunit proteins consisting of α, β and γ subunits.
D.
They act as transducers for hormones
Chapter 11 Solutions
Study Guide for Campbell Biology
Ch. 11 - How do plant hormones (often called plant growth...Ch. 11 - Prob. 2IQCh. 11 - Label the parts in the following diagram of an...Ch. 11 - Prob. 4IQCh. 11 - a. What does a protein kinase do? b. What is a...Ch. 11 - Prob. 6IQCh. 11 - Prob. 7IQCh. 11 - Prob. 8IQCh. 11 - a. What can one conclude from the fact that the...Ch. 11 - Prob. 1SYK
Ch. 11 - Briefly describe the three stages of cell...Ch. 11 - Some signaling pathways alter a proteins activity;...Ch. 11 - Prob. 4SYKCh. 11 - Prob. 1TYKCh. 11 - Steroid hormones a. bind to cell-surface...Ch. 11 - Prob. 3TYKCh. 11 - Prob. 4TYKCh. 11 - Which of the following is a key difference between...Ch. 11 - Many human diseases (including bacterial...Ch. 11 - Prob. 7TYKCh. 11 - If a protein is activated by the addition of a...Ch. 11 - Prob. 9TYKCh. 11 - Prob. 10TYKCh. 11 - From studying the effects of epinephrine on liver...Ch. 11 - You are a Ca2+ ion in a typical animal cell. Where...Ch. 11 - Which of the following molecules is incorrectly...Ch. 11 - Prob. 14TYKCh. 11 - Prob. 15TYK
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