Human Physiology: An Integrated Approach (8th Edition)
8th Edition
ISBN: 9780134605197
Author: Dee Unglaub Silverthorn
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 23RQ
Explain how inserting cholesterol into the phospholipid bilayer of the cell membrane decreases membrane permeability.
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A phospholipid bilayer with equal amounts of saturated and unsaturated fatty acids displays a specific permeability to glucose. What effect will increasing the proportion of unsaturated fatty acids in the bilayer have on the membrane's permeability to glucose?
Distinguish molecules that can diffuse through a lipid bilayer from those that must be transported. Describe the transport of small molecules by carrier proteins, and contrast ion channels and pores. Explain how ion gradients can drive active transport across membranes.
Describe ONE modification that could happen to the phospholipids in a membrane that would increase the permeability of the membrane to small non-polar molecules such as oxygen gas. Explain why this modification would increase membrane permeability.
Chapter 3 Solutions
Human Physiology: An Integrated Approach (8th Edition)
Ch. 3.2 - Name three types of lipids found in cell...Ch. 3.2 - Describe three types of membrane proteins and how...Ch. 3.2 - Why do phospholipids in cell membranes form a...Ch. 3.2 - How many phospholipid bilayers will a substance...Ch. 3.3 - Name the three sizes of cytoplasmic protein...Ch. 3.3 - How would the absence of a flagellum affect a...Ch. 3.3 - Prob. 7CCCh. 3.3 - Prob. 8CCCh. 3.3 - What is the function of motor proteins?Ch. 3.3 - What distinguishes organelles from inclusions?
Ch. 3.3 - Prob. 11CCCh. 3.3 - Prob. 12CCCh. 3.3 - Prob. 13CCCh. 3.3 - Prob. 14CCCh. 3.3 - Examining tissue from a previously unknown species...Ch. 3.4 - Prob. 16CCCh. 3.4 - Prob. 17CCCh. 3.4 - Prob. 18CCCh. 3.4 - Prob. 19CCCh. 3.4 - Name two properties that distinguish endocrine...Ch. 3.4 - The basal lamina of epithelium contains the...Ch. 3.4 - You look at a tissue under a microscope and see a...Ch. 3.4 - Prob. 23CCCh. 3.4 - What is the distinguishing characteristic of...Ch. 3.4 - Prob. 25CCCh. 3.4 - Name six types of connective tissues.Ch. 3.4 - Prob. 27CCCh. 3.4 - Why does torn cartilage heal more slowly than a...Ch. 3.5 - Prob. 29CCCh. 3 - Prob. 1RQCh. 3 - In 1972, Singer and Nicolson proposed the fluid...Ch. 3 - Prob. 3RQCh. 3 - Prob. 4RQCh. 3 - Define cytoskeleton. List five functions of the...Ch. 3 - Match each term with the description that fits it...Ch. 3 - Prob. 7RQCh. 3 - Match each organelle with its function:Ch. 3 - Prob. 9RQCh. 3 - Prob. 10RQCh. 3 - List the four major tissue types. Give an example...Ch. 3 - Prob. 12RQCh. 3 - Prob. 13RQCh. 3 - Prob. 14RQCh. 3 - Prob. 15RQCh. 3 - Prob. 16RQCh. 3 - Which would have more rough endoplasmic reticulum:...Ch. 3 - A number of organelles can be considered vesicles....Ch. 3 - Prob. 19RQCh. 3 - Prob. 20RQCh. 3 - Prob. 21RQCh. 3 - Prob. 22RQCh. 3 - Explain how inserting cholesterol into the...Ch. 3 - Prob. 24RQCh. 3 - Prob. 25RQCh. 3 - Prob. 26RQCh. 3 - Prob. 27RQCh. 3 - Prob. 28RQCh. 3 - One result of cigarette smoking is paralysis of...Ch. 3 - Prob. 30RQCh. 3 - Prob. 31RQ
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- Please describe the hydrophobic effect and its contribution to membrane protein folding.arrow_forwardDescribe what gap junction are, emphasizing on how they are different two other cellular points of contact, their protein components and cellular function. Describe the three main sources of membrane fluidity. Describe in detail what proteoglycans are, including their hygroscopicity and biological roles.arrow_forwardCells transporting substances across their membranes is essential. Choose TWO of the following types of cellular transport. ๏osmosis ๏active transport ๏facilitated diffusion ๏endocytosis / exocytosis (a)For each type of transport you choose, describe the transport process. Explain how the organization of cell membrane plays a role the movement of specific molecules across membrane. (b)Using the same transport types, identify a specific cell that utilizes that type of transit (i.e. one cell for each transport type, or two different cell examples), and detail a substance that is transferred. (c)A typical human lymphocyte has a radius of about 10 μm, while a typical bacterium (e.g., S. pneumoniae) has a radius of about 1 μm. Assuming that both cell types are perfectly spherical, compare and contrastthe transport mechanisms for each of these cells.arrow_forward
- (a) Describe permeability of a phospholipid bilayer for the following molecules. Use terms: non-permeable, high permeability, medium permeability. N2, O2, Na+, glucose, sucrose (disaccharide), glycogen, H2O, KCl, K+, Mg2+, glycine and protein (b) Discuss the role of carbonic anhydrase in CO2 transport. (c) Discuss the cause of ‘cold denaturation’ of proteins.arrow_forwardwhy is unsaturated fatty acid used to maintain membrane fluidity and flexibility?arrow_forwardExplain the cell membrane’s lipid bilayer. What are the lipids found in the cell membrane? Differentiate between passive and active transport movement of molecules across the cell membrane.arrow_forward
- Glucose (C6H12O6) exhibits which of the following membrane transport movements? it is able to cross the membrane by facilitated diffusion, because it is small, polar, and organic it is not able to cross the membrane by passive transport, because it is big, polar, and inorganic it is able cross the membrane by simple diffusion, because it is small, nonpolar, and inorganic it is not able to cross the membrane by active transport, because it is big, polar, and inorganic it is able to cross the membrane by active transport, because it is big, nonpolar, and organic 10. A red blood cell that displays a biconcave disc shape must be in which of the following solutions? hypertonic solution distilled water isotonic solution ocean water hypotonic solutionarrow_forwardAside from cholesterol, what other chemical components of the cell membrane contributes to its property of being fluid. Explain. NOTE: Please add references from different sources.arrow_forwardDefine cell membrane transport and membrane selectivity. Explain why the plasma membrane is selectively permeable. List and discuss which molecules can and cannot cross the membrane and explain why. Discuss why some molecules can cross directly while others require transport proteins.arrow_forward
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