Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 34.3, Problem 1R
Summary Introduction
To review:
The role of K+ (potassium) ions in the functioning of the guard cells.
Introduction:
The guard cells are the type of specialized cells found in the leaf epidermis, stems as well as other organs that take part in controlling the gaseous exchange. These cells are formed in pairs having a gap between them that forms the stomatal pore. Ion uptake into the guard cell causes the opening of the stomata.
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Life: The Science of Biology
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- Do GPCR ligands physically enter the cell through their receptor? a) Yes b) Noarrow_forwardWhat limits the activity of intracellular mediators, such ascGMP, and phosphorylated proteins?arrow_forwardImagine being on the TV show Survivor of the Smartest and you are stuck on an island with only a few tools. You are given a bow, 1 arrow, and two vials. One is labeled ‘Na Pump antagonist’ and the other is labeled ‘Na Channel agonist’. The arrows are to capture food, of course. You are an average shot! What will you coat the arrow tips with and why? Please, if you are not a meat eater then pretend that you can trade the meat for a bean burrito!arrow_forward
- How do Chemical messengers participate in local responses?arrow_forwardWhat accounts for the specificity of a cellular response to a signal molecule?arrow_forwardWhich statement is TRUE regarding the Na+ voltage-gated channel in neurons? A) Similar to the potassium ion channel, it exists as a tetramer in the membrane. B) Aspartate residues are part of the voltage-sensing helices. C) Positive membrane potentials on the extracellular side will close the channel. D) Ion specificity comes from the voltage-sensing helices.arrow_forward
- All except which one of the following can be a function of the heterotrimeric G protein of a GPCR? a) inhibit adenylyl cyclase b) activate adenylyl cyclase c) act as a protein kinase d) activate ion channelsarrow_forwardWhen comparing two or more ligands, a larger numerical value for KD corresponds to a higher binding affinity. True False In radioligand binding assays, a large excess of a noncompetitive antagonist is used to determine the specific binding of the radiolabeled ligand. True False Exocrine glands have ducts that provide a passageway for secretions to move to the surface of the epithelium. True False An inverse agonist binds to a receptor with an affinity that is inversely proportional to its potency. True False Can I get the answer? I don't need explanationarrow_forwardPlease answer both questions: 1) The sodium-potassium pump: a) equalizes the charge distribution across the cell membrane. b) transports K+ into the cell where it is in high concentration. c) requires very little energy expenditure on the part of nerve cells. d) establishes concentration gradients across the cell membrane. 2) Membrane potentials are always expressed comparing the inside of the cell relative to the outside of the cell. The resting membrane potential is -70 mV because the inside of the cell accumulates ions with negative charges. a) True b) Falsearrow_forward
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