Anatomy & Physiology
5th Edition
ISBN: 9780321861580
Author: Marieb, Elaine N.
Publisher: Pearson College Div
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Textbook Question
Chapter 3, Problem 4CYU
Why do phospholipids, which form the greater part of membranes, organize into a bilayer—tail-to-tail—in a watery environment?
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Which portion of the phosphatidylinositol molecule contributes to (a) fluidity of the bilayer and (b) the surface polarity of the bilayer?
According to the fluid mosaic model of cell membranes, which of the following is a
true statement about membrane phospholipids?
They frequently flip-flop from one side of the membrane to the other.
They have hydrophilic tails in the interior of the membrane.
They can move laterally along the plane of the membrane.
They are free to depart from the membrane and dissolve in the surrounding solution.
What causes phospholipids to spontaneously orient themselves into a membrane-like structure?
Chapter 3 Solutions
Anatomy & Physiology
Ch. 3 - Summarize the four key points of the cell theory.Ch. 3 - How would you explain the meaning of a generalized...Ch. 3 - What basic structure do all cellular membranes...Ch. 3 - Why do phospholipids, which form the greater part...Ch. 3 - What is the importance of the glycocalyx in cell...Ch. 3 - Prob. 6CYUCh. 3 - What is the energy source for all types of...Ch. 3 - What determines the direction of any diffusion...Ch. 3 - What are the two types of facilitated diffusion...Ch. 3 - What happens when the Na+-K+ pump is...
Ch. 3 - As a cell grows, its plasma membrane expands. Does...Ch. 3 - Prob. 12CYUCh. 3 - Which vesicular transport process allows a cell to...Ch. 3 - What process establishes the resting membrane...Ch. 3 - Prob. 15CYUCh. 3 - What term is used to indicate signaling chemicals...Ch. 3 - Which organelle is the major site of ATP...Ch. 3 - What are three organelles involved in protein...Ch. 3 - Compare the functions of lysosomes and...Ch. 3 - How are microtubules and microfilaments related...Ch. 3 - Prob. 21CYUCh. 3 - Prob. 22CYUCh. 3 - If a cell ejects or loses its nucleus, what is its...Ch. 3 - What is the role of nucleoli?Ch. 3 - What is the role of nucleoli?Ch. 3 - If one of the DNA strands being replicated reads...Ch. 3 - During what phase of the cell cycle is DNA...Ch. 3 - What are three events occurring in prophase that...Ch. 3 - Codons and anticodons are both three-base...Ch. 3 - How do the A, P, and E ribosomal sites differ...Ch. 3 - What is the role of DNA in transcription?Ch. 3 - What is the importance of ubiquitin in the life of...Ch. 3 - Prob. 33CYUCh. 3 - The smallest unit capable of life by itself is (a)...Ch. 3 - Prob. 2RQCh. 3 - Prob. 3RQCh. 3 - The term used to describe the type of solution in...Ch. 3 - Osmosis always involves (a) a selectively...Ch. 3 - Prob. 6RQCh. 3 - Prob. 7RQCh. 3 - The endocytotic process in which a sampling of...Ch. 3 - Prob. 9RQCh. 3 - The nuclear substance composed of histone proteins...Ch. 3 - The information sequence that determines the...Ch. 3 - Mutations may be caused by (a) X rays, (b) certain...Ch. 3 - The phase of mitosis during which centrioles each...Ch. 3 - Final preparations for cell division are made...Ch. 3 - The RNA synthesized on one of the DNA strands is...Ch. 3 - The RNA species that travels from the nucleus to...Ch. 3 - If DNA has a sequence of AAA, then a segment of...Ch. 3 - A nerve cell and a lymphocyte are presumed to...Ch. 3 - Prob. 19RQCh. 3 - Explain why mitosis can be thought of as cellular...Ch. 3 - Contrast the roles of ER-bound ribosomes with...Ch. 3 - Cells lining the trachea have whiplike motile...Ch. 3 - Name the three phases of interphase and describe...Ch. 3 - Comment on the role of the sodium-potassium pump...Ch. 3 - Differentiate between primary and secondary active...Ch. 3 - Cell division typically yields two daughter cells,...
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- Knowing that there is constant turnover of phospholipids in a cell’s membrane and that new phospholipids are regularly synthesized, what strategy could a cell (or organism) use to maintain membrane fluidity and integrity in: A) Cold temperatures? B) Hot temperatures?arrow_forwardAlthough both faces of a biomembrane are composed of the same general types of macromolecules, principally lipids and proteins, the two faces of the bilayer are not identical. What accounts for the asymmetry between the two faces?arrow_forwardWhich portion of a phospholipid is found in the middle (the interior) of a membrane?arrow_forward
- A) how does a phospholipid differ from a fat? Why is this important for the cells lipid by layer? B) what is the difference between active and passive transport?arrow_forwardDraw the basic structure of a lipid bilayer and label thehydrophilic and hydrophobic regions. Why is the cytoplasmicmembrane a good permeability barrier?arrow_forwardHow does the phospholipid bilayer of a liposome differ from the phospholipid bilayer of the plasma membrane of a cell? (a) The phospholipid bilayer of a liposome contains only phospholipids, without the proteins that are embedded in the plasma membrane of a cell. (b) The phospholipid bilayer of a liposome contains two bilayers of phospholipid molecules, whereas the plasma membrane of a cell contains only one. (c) The phospholipid bilayer of a liposome completely envelops the liposome, whereas the plasma membrane of a cell does not completely envelop the cell. (d) The phospholipid molecules in the phospholipid bilayer of a liposome are oriented with the lipid ends on the outside of the bilayer and the phosphate groups on the inside.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) 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_forwardWhat features in the chemical composition of phospholipids make them ideal components of the cytoplasmic membrane?arrow_forwardWhat is the phospholipid bilayer made of?arrow_forward
- How do we know that membrane phospholipids regularly intermingle and move laterally, but rarely flip from one side of the phospholipid bilayer to the other?arrow_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) 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_forwardwhat purpose does the plasma membrane’s hydrophobic interior serve?arrow_forward
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