Anatomy & Physiology
5th Edition
ISBN: 9780321861580
Author: Marieb, Elaine N.
Publisher: Pearson College Div
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Chapter 3, Problem 2RQ
Summary Introduction
Introduction:
The lipid membrane consists of phospholipids, glycolipids, and cholesterol. The cholesterol occurs naturally in the cell membranes of the eukaryotes. It is biosynthesized from mevalonate. The membranes need larger levels of cholesterol to promote the aggregation of peripheral and transmembrane proteins. The phospholipids are long, having a polar and two nonpolar heads that contribute to structural stability.
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Which of the following statements is (are) consistent with what is known about membranes? (a) A membrane consists of a layer of proteins sandwiched between two layers of lipids. (b) The compositions of the inner and outer lipid layers are the same in any individual membrane. (c) Membranes contain glycolipids and glycoproteins. (d) Lipid bilayers are an important component of membranes. (e) Covalent bonding takes place between lipids and proteins in most membranes.
What effect will increasing the proportion of unsaturated fatty acids in the bilayer have on the membrane's permeability to glucose?
A) Permeability to glucose will increase.
B) Permeability to glucose will decrese.
C) Permeability to glucose will stay the same.
D) Permeability will decrease initially then increase as the bilyaer fills with glucose.
1)What is the second type of lipid that plays a major role in the plasma membrane? This lipid does not have polar and nonpolar regions (its not amphiphilic) but plays a critical role in membrane permeability.
A)Triglycerdies
B) Steriod hormones
c) cholesterol
2) In _______________, a single substrate/solute move from a high concentration area to a lower concentration are without the aid of any additional molecules.
A) Diffusion
B)Facilitated diffusion
C) Cotransport
3)Channel proteins require a confirmational change in order to properly function.
A) Hydrophilic
B) ionic
C) Polar
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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The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license