Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 3, Problem 12TYU
Summary Introduction
To review:
The cell’s ability to regulate the function of proteins in case they are folded into rigid, inflexible structures.
Introduction:
The regulation of protein’s activity is controlled by the protein when it is folded into its active form at particular target site.
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What are the types of transmembrane proteins that allow for the movement of substances across biological membranes?
Part a) Would a single alpha helix be more stable in a aqueous solution or a membrane. Explain why.
Part b) Why do transmembrane proteins always have secondary structures inside the membrane but aqueous proteins do not?
Part c) If you had a single alpha helix, can it act as a pore for a membrane. Explain.
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- In a plasma membrane, the tails of phospholipids orient toward each other because they are?arrow_forwardif the membrane composition of the golgi in a cell is incorrect, what could have happened?arrow_forwardDescribe the lipid bilayer structure of a cell membrane. What are the roles of proteins in membrane structure?arrow_forward
- In the "fluid " _______ cell membrane model, lipids are organized in a ________ arrangement, such that _______ portions of the lipids are exposed to either the interior or exterior of the cell, while the lipid portions are sandwiched in the middle of the membrane. As part of the cell membrane, a main function of peripheral proteins is to provide _________ , while a main function of proteins is to provide _________ . Other cell membrane molecules include a compound called __________, which functions to provide fluidity to rigid membranes and rigidity to fluid membranes; and surface carbohydrates, which function in the membrane not to provide energy, but instead to provide _________ _____ . Aminophospholipids (including PE and ) move to the inner leaflet of the membrane, by an enzyme known as the ._______ A main function of the cell membrane is to be very selective as to what is able to cross through, a condition known as a barrier.arrow_forwardWhat makes up a Plasma Membrane?arrow_forwardwhy do transmembrane proteins cross the phospholipid bilayer as an a-helix or B-barrel? A. These structures arrange polar peptide bonds and hydrogen bonds to the exterior of the helix or barrel while nonpolar side chains are on the interior. B. These structures sequester polar peptide bonds and hydrogen bonds to the interior of the helix or barrel while nonpolar sidechains are on the exterior.arrow_forward
- What do the Lysosomes consist of?arrow_forwardThere is a long chain of amino acids with long sections that are mostly polar, alternating with long sections that are nonpolar. How would this chain be organized if it were destined to become a transmembrane protein? A cytoplasmic protein?arrow_forwardCan you list two different ways in which nucleotides can carry energy and draw a diagram of the cross-section of a typical plasma membrane?arrow_forward
- b) Cellular membranes are generally found in environments that contain lots of water. Draw a diagram of what the phospholipid bilayer of a plasma membrane would look like if it were placed in a hydrophobic environment. (**Note that you only have to draw the phospholipid bilayer, you don't have to draw the other major components again as you did in part a) poned In salt wer (ho byorout obods f.Cplan why sctive tnsport is requind in tive tre nolaib beisio c) What part or parts of a cellular membrane play(s) a role in determining the fluidity of the membrane? pslomlo belowarrow_forwardb) Cellular membranes are generally found in environments that contain lots of water. Draw a diagram of what the phospholipid bilayer of a plasma membrane would look like if it were placed in a hydrophobic environment. (**Note that you only have to draw the phospholipid bilayer, you don't have to draw the other major components again as you did in part a) c) What part or parts of a cellular membrane play(s) a role in determining the fluidity of the membrane? 8) Indicate which of the five major types of membrane protein (adhesion, enzymatic, reco receptor, and transport) is most likely to be involved in each of the situations described be a) An oncologist wants to study the cells from a certain tumour that has been surgically re from a patient. However, she must first treat the tumour with a solution affects a membra protein on the tumour cells. Because of the effect of the solution on the membrane protei tumour tissue falls apart into individual cells. Type of membrane protein: ans…arrow_forwardIn the figure below, an integral membrane protein is shown. These proteins sit inside of cell membranes. Some integral proteins are membrane channels or transporters, while others serve as enzymes, receptors, or anchors. Describe the differences you would expect to see in the amino acid side chains on the outer surface of an integral cell membrane protein, as compared to a water-soluble globular protein. Be sure to discuss the chemical nature of the cell membrane in your answer.arrow_forward
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