Which of the following is a direct step in the activation of a rod photoreceptor? Activation...
- Which of the following is a direct step in the activation of a
rod photoreceptor?
- Activation of transducing by a photon
- Activation of phosphodiesterase by rhodopsin
- Opening of cGMP-dependent cation channels
- Phosphorylation of GDP to GTP by transducing
- Conversion of cGMP to GMP by phosphodiesterase
Homework Answers
Ans.) Option C : Opening of cGMP- dependent cation channels.
Explanation: In dark, inactive photodieasterase donot act upon cGMP to convert it to GMP so the amount of cGMP increases intracellularly which leads to opening of Na+ channels, causing depolarisation of rod cells and causing increased release of neurotransmitter
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Which of the following is a direct step in the activation of a
rod photoreceptor?
Activation...
Rhodopsin, a light-sensitive GPCR whose role in vision is dependent on its phosphorylation status, is influenced...
Rhodopsin, a light-sensitive GPCR whose role in vision is dependent on its phosphorylation status, is influenced in part by the protein arrestin. Which of the following is true in regards to rhodopsin and vision? Select one: a. Rhodopsin phosphatase increases the degree of rhodopsin phosphorylation b. Arrestin binds to the completely phosphorylated opsin to inhibit signaling c. Rhodopsin activation promotes the opening of a cGMP-gated ion channel d. none of the above
Which of the following could a phosphodiesterase inhibitor lead to? Select all that apply. a. higher...
Which of the following could a phosphodiesterase inhibitor lead to? Select all that apply. a. higher levels of cAMP b. longer opening of cyclic nucleotide-gated channels c. prolonged activation of Golf d. prolonged activated of adenylate cyclase e. more phosphorylation of ion channels
Epinephrine signaling , like that of insulin, is a multi-step pathway with several amplification steps. Identify...
Epinephrine signaling , like that of insulin, is a multi-step
pathway with several amplification steps. Identify each of the
steps below as either allosteric activation or enzymatic.
Abbreviations: Epi (epinephrine), β2AR
(β2 adrenergic receptor), R2C2
(subunit composition of protein kinase A where R is the regulatory
subunit and C is the catalytic subunit), PDE (cyclic AMP
phosphodiesterase), PPase (phosphoprotein phosphatase).
One of these is wrong but I don't know which one you can only
choose enzymatic or allosteric as the answer...
Which of the following reverses the direct physiological effect of the compound shown below? A. cAMP...
Which of the following reverses the direct physiological effect
of the compound shown below?
A. cAMP phosphodiesterase
B. cGMP phosphodiesterase
C. Phospholipase C
D. Ca2+ATPase
E. None of the above. The physiological effect of this compound
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Which of the following events normally activates a receptor tyrosine kinase GTP hydrolysis by the protein...
Which of the following events normally activates a receptor tyrosine kinase GTP hydrolysis by the protein Dimerization and phosphorylation Activation of an upstream GTPase-activating protein Phosphorylation of a bound GDP molecule by an upstream phosphorylase
QUESTION 1 AGº for the hydrolysis of ATP is considered to be: O highly endergonic O...
QUESTION 1 AGº for the hydrolysis of ATP is considered to be: O highly endergonic O highly exergonic O slightly endergonic O slightly exergonic QUESTION 2 Which of the following most closely approximates a second messenger? An odorant receptor on the surface of a mouse olfactory epithelium cell that undergoes a o conformational change upon binding of metabolites (breakdown products) of thyroid hormones, activating an intracellular G-protein. Ca=ions flowing into the cytoplasm and there binding to a protein on the...
Which of the following is a step required for T cytotoxic cell activation - SELECT ALL...
Which of the following is a step required for T cytotoxic cell activation - SELECT ALL THAT APPLY Group of answer choices activation of the complement antigen binding to antibody CD4 binding to MHC-I T cell receptor (TCR) binding to antigen Which of the following is a direct consequence of T cytotoxic cell activation -SELECT ALL THAT APPLY Group of answer choices phagocytosis release of perforin and granzyme activation of the complement system release of alpha and beta interferon death...
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Which of the following accurately describes a step in GTP-driven nuclear transport? GTP hydrolysis powers a membrane-bound transporter protein. GTP-bound cargo interacts specifically with the protein fibrils of the pore. Binding of Ran-GTP to the receptor releases the cargo protein. Ran-GDP escorts the nuclear receptor back to the cytosol.
Signal amplification is an essential step in signal transduction. Which of the following steps of signal...
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open to look at all pictures Multiple Choice Which of the following are true of G...
open to look at all pictures
Multiple Choice Which of the following are true of G protein coupled receptors (GPCRs) A) peripheral membrane protein B) Activates G proteins on cytoplasmic side C) Receptors to lipid soluble hormones D) Binds ligands on cytoplasmic side Submit CASTILLO NAVA Invoice Soon Multiple Choice Which of the following are true of G proteins A) Are integral membrane proteins B) Works with G protein coupled receptors C) dimer D) On the exoplasmic side of membrane...
Epinephrine signaling , like that of insulin, is a multi-step
pathway with several amplification steps. Identify each of the
steps below as either allosteric activation or enzymatic.
Abbreviations: Epi (epinephrine), β2AR
(β2 adrenergic receptor), R2C2
(subunit composition of protein kinase A where R is the regulatory
subunit and C is the catalytic subunit), PDE (cyclic AMP
phosphodiesterase), PPase (phosphoprotein phosphatase).
One of these is wrong but I don't know which one you can only
choose enzymatic or allosteric as the answer...
QUESTION 1 AGº for the hydrolysis of ATP is considered to be: O highly endergonic O highly exergonic O slightly endergonic O slightly exergonic QUESTION 2 Which of the following most closely approximates a second messenger? An odorant receptor on the surface of a mouse olfactory epithelium cell that undergoes a o conformational change upon binding of metabolites (breakdown products) of thyroid hormones, activating an intracellular G-protein. Ca=ions flowing into the cytoplasm and there binding to a protein on the...
open to look at all pictures
Multiple Choice Which of the following are true of G protein coupled receptors (GPCRs) A) peripheral membrane protein B) Activates G proteins on cytoplasmic side C) Receptors to lipid soluble hormones D) Binds ligands on cytoplasmic side Submit CASTILLO NAVA Invoice Soon Multiple Choice Which of the following are true of G proteins A) Are integral membrane proteins B) Works with G protein coupled receptors C) dimer D) On the exoplasmic side of membrane...
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