BIOLOGY
5th Edition
ISBN: 9781264104680
Author: BROOKER
Publisher: MCG
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Chapter 5.3, Problem 2CC
Summary Introduction
To explain: The structural feature of a polypeptide that causes a region to form transmemrane segment.
Introduction: The proteins are found in two different forms in the cell membrane. The first forms are embedded in the membrane and hence are called transmembrane proteins or integrin proteins. The other types of proteins are found at the periphery of the cell membrane and are called as peripheral proteins. These both proteins are made up of the polypeptide chains but it is the two dimensional structure that decides their role.
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The transmembrane segments of most integral membrane proteins are made of alpha -helical secondary structures. What is the advantage of this conformation ? How do multiple alpha-helices arrange themselves to form the aqueous pore of an ion channel ?
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(ii)Give THREE (3) amino acids that most likely can be
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Chapter 5 Solutions
BIOLOGY
Ch. 5.1 - Core Skill: Modeling The goal of this modeling...Ch. 5.2 - Prob. 1CSCh. 5.3 - Prob. 1CCCh. 5.3 - Prob. 2CCCh. 5.4 - Prob. 1CSCh. 5.4 - Prob. 2CSCh. 5.4 - Lets suppose the inside of a cell has a solute...Ch. 5.5 - What is the purpose of gating?Ch. 5.5 - Prob. 1EQCh. 5.5 - Prob. 2EQ
Ch. 5.5 - Prob. 3EQCh. 5.6 - What is the function of the protein coat?Ch. 5 - Prob. 1TYCh. 5 - Which of the following events can never be...Ch. 5 - Lets suppose an insect, which doesnt maintain a...Ch. 5 - Prob. 4TYCh. 5 - Prob. 5TYCh. 5 - Prob. 6TYCh. 5 - Prob. 7TYCh. 5 - Prob. 8TYCh. 5 - Prob. 9TYCh. 5 - Large particles or large volumes of fluid can be...Ch. 5 - With your textbook closed, draw and describe the...Ch. 5 - Prob. 2CQCh. 5 - Prob. 3CQCh. 5 - Prob. 1COQCh. 5 - With regard to bringing solutes into the cell...
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- What is the relationship between the nucleus and the endomembrane system in protein synthesis?arrow_forwardMany transmembrane proteins have a large series of hydrophobic amino acids such as those in the middle of the protein (around b). Why would this make sense, and where would you expect these to be located in the final protein structure?arrow_forwardFour of the most abundant amino acids in proteins are leucine, alanine, glycine, and valine. What do these amino acids have in common? Would you expect these amino acids to be found on the interior or on the exterior of theprotein?arrow_forward
- Many transmembrane proteins are oligomeric, with several identical subunits. The oligomers are usually found to have some form of Cn symmetry, rather than Dn or any higher order. Suggest a reason for this observation.arrow_forwardWhat are the functions of thesurprisingly large amount of unfoldedpolypeptide chain found in proteins?arrow_forwardWhat exactly causes the P, A, and E sites in ribosomes to form and when do they form?arrow_forward
- Glycophorin is an integral membrane protein found on the surface of red blood cells that is important for binding to the malaria parasite. Name three different amino acids that you might expect to be present in the region of this protein that spans the lipid bilayer and name three different amino acids that you would expect to be absent from this region. For each group, describe what those amino acids have in common that distinguishes them from the other group.arrow_forwardCell membranes are fluid, and thus proteins can diffuse laterally within the lipid bilayer. However, sometimes the cell needs to localize proteins to a particular membrane domain. Name three mechanisms that a cell can use to restrict a protein to a particular place in the cell membrane.arrow_forwardIs adenylate cyclase a transmembrane protein or a peripheralprotein? What about the G protein?arrow_forward
- What four components are required for the translocation of proteins across the endoplasmic reticulum membrane?arrow_forwardThe usual hydrophobic region of a membrane is around 30 Angstroms. Knowing this, about many amino acid residues would a transmembrane helix have?arrow_forwardBiological membranes are critical components of cells that allow compartmentalisation of cellular contents. The diagram shows a biological membrane comprised of a lipid bilayer with a single polypeptide integrated into the membrane and spanning the membrane seven times. What types of amino acids are likely present in the parts of the polypeptide chain labelled 1-7 and in the parts of labelled A-G? What is the name of the effect that forces the polypeptide to arrange itself like this within the lipid bilayer? Give an example of a type of molecule that can move freely across the lipid bilayer and explain why it can do so based on its chemical properties.arrow_forward
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