Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 43, Problem 12PIAT
Summary Introduction
To review:
The research technique that could be used to discover the effect of BTX (batrachotoxin) on specific membrane proteins, and the result of the technique on the basis of the given graph.
Introduction:
The BTX is a milky compound that is highly toxic in nature and is secreted from the skin of some frog species. It opens the sodium channel and causes membrane depolarization. The graph showing the effect of BTX on the membrane potential of a squid giant axon is given below:
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Chapter 43 Solutions
Biological Science (6th Edition)
Ch. 43 - Prob. 1TYKCh. 43 - Prob. 2TYKCh. 43 - In a neuron, what creates the electrochemical...Ch. 43 - Prob. 4TYKCh. 43 - Explain the difference between a ligand-gated K+...Ch. 43 - Prob. 6TYUCh. 43 - Prob. 7TYUCh. 43 - Prob. 8TYUCh. 43 - Prob. 9TYPSSCh. 43 - Alzheimer’s disease is a common form of dementia...
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- Second-messenger systems ultimately bring about the desired cell response by inducing a change in the shape and function of particular designated intracellular proteins. (True or false?)arrow_forwardContrast the plasma membrane characteristics of organisms in warm tropical regions to those living in the coldest places on Earth. Explain why these adjustments in plasma membrane character are made depending on the temperature of where an organism lives.arrow_forwardWhen rhodamine-dyed mouse proteins were first mixed with fluorescein-dyed human proteins (in mouse/human hybrid cell fusions), these proteins appeared to exhibit: restricted movement, based on confinement by diffusion barriers restricted movement, based on tethering to extracellular molecules unrestricted movement, similar to membrane phospholipids restricted movement, based on anchoring to intracellular proteins restricted movement, based on attachment to other cellsarrow_forward
- Which among the following defines GPI anchored proteins? 1)Integral proteins of the plasma membrane 2)Peripheral proteins of the plasma membrane 3)Proteins that bind to ion-gated channels in the plasma membrane 4)Proteins which randomly bind to lipids of the plasma membranearrow_forwardName and define (briefly) two of the different possible mechanisms of a plasma membrane proteinsarrow_forwardWhen fluorescein-dyed human proteins were first mixed with rhodamine-dyed mouse proteins (in mouse/human hybrid cell fusions carried out in the 1970s), these proteins appeared to exhibit: restricted movement, based on confinement by diffusion barriers restricted movement, based on tethering to extracellular molecules unrestricted movement, similar to membrane phospholipids restricted movement, based on anchoring to intracellular proteins restricted movement, based on attachment to other cellsarrow_forward
- Na+ moves from high to low concentration, across the plasma membrane, through a protein channel that is permenantly open. Which statement is true about this process? a. It does not require ATP b. It is a form of active transport c. Movement is against the concentration gradient of Na+ d. The channel probably allows many different molecules and ions to crossarrow_forwardAs we age our skin becomes thin and easily tears. One potential reason to explain would be if adjacent cells within the skin lose the ability to attach to each other strongly. Another reason could be that cells lose the ability to attach strongly to the extracellular matrix. Compare and contrast these membrane functions and suggest which proteins might be “lost” as we age to cause the loss of attachment function in each scenarioarrow_forwardVarious types of vesicle coats have been implicated in membrane traffic pathways such as endocytosis, export from the ER to the Golgi, and transport between Golgi cisternae. But so far, no coat has been identified for the secretory vesicles that carry material from the Golgi to the plasma membrane. Do you think such a coat is likely to exist?arrow_forward
- What would happen in each of the following cases where something related to intracellular transport is altered? Assume in each case that the protein involved is a soluble protein, not a membrane protein. State where each protein would be located and explain each of your answers. You change the hydrophobic amino acids in an ER signal sequence into negatively charged amino acids. You discover a protein that has both an ER signal sequence and a nuclear localization sequence. The ER signal sequence is at the N-terminus of the protein, and the nuclear localization sequence is located in the middle of the protein.arrow_forwardWhich is the definition of 'retrograde' with respect to membrane trafficking? movement from the endosome to the lysosome movement from the ER to the Golgi to either the plasma membrane or the endosome/lysosome movement from the cytoplasm to the nucleus movement from the Golgi to the ERarrow_forwardWhat would happen in each of the following cases where something related to intracellular transport is altered? Assume in each case that the protein involved is a soluble protein, not a membrane protein. State where each protein would be located and explain each of your answers. You add a signal sequence (for the Golgi) to the N-terminal end of a normally cytosolic protein. You change the hydrophobic amino acids in an ER signal sequence into other, hydrophobic, amino acids.arrow_forward
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