Biology Today and Tomorrow without Physiology (MindTap Course List)
5th Edition
ISBN: 9781305117396
Author: Cecie Starr, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Textbook Question
Chapter 3, Problem 8SQ
In a lipid bilayer, the of all the lipid molecules are sandwiched between all of the __________.
- a. hydrophilic tails; hydrophobic heads
- b. hydrophilic heads; hydrophilic tails
- c. hydrophobic tails; hydrophilic heads
- d. hydrophobic heads; hydrophilic tails
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The structure of a lipid bilayer is determined by the particular properties of its lipid molecules. What would happen if A. Phospholipids had only one hydrocarbon tail instead of two?B. The hydrocarbon tails were shorter than normal, say, about 10 carbon atoms long?C. All of the hydrocarbon tails were saturated?D. All of the hydrocarbon tails were unsaturated?E. The bilayer contained a mixture of two kinds of phospholipid molecules, one with two saturated hydrocarbon tails and the other with two unsaturated hydrocarbon tails?F. Each phospholipid molecule were covalently linked through the end carbon atom of one of its hydrocarbon tails to a phospholipid tail in the opposite monolayer?
Positively charged molecules are often more easily endocytosed by cells than negatively charged molecules. Which of these BEST explains this observation?
A.
The hydrocarbon tails of membrane lipids are hydrophilic.
B.
The hydrocarbon tails of membrane lipids are hydrophobic.
C.
The phosphate group of membrane lipids are positively charged.
D.
The phosphate group of membrane lipids are negatively charged.
Which of the following best describes the lipid aggregates known as liposomes?
A. They contain a hollow non-aqueous interior cavity.
B. They are spherical structures with their hydrophobic regions aggregated in the interior cavity.
C. They form because the cross-sectional area of the head group is greater than that of the acyl side chain(s).
D. They are derived from a bilayer sheet.
Chapter 3 Solutions
Biology Today and Tomorrow without Physiology (MindTap Course List)
Ch. 3 - Prob. 1FIOCh. 3 - Organelles and Cystic Fibrosis A plasma membrane...Ch. 3 - Organelles and Cystic Fibrosis A plasma membrane...Ch. 3 - Prob. 3DIDCh. 3 - All cells have these three things in common: a....Ch. 3 - Unlike eukaryotic cells, prokaryotic cells...Ch. 3 - Every cell is descended from another cell. This...Ch. 3 - Prob. 4SQCh. 3 - True or false? Some protists start out life with...Ch. 3 - Cell membranes consist mainly of ________ and...
Ch. 3 - Prob. 7SQCh. 3 - In a lipid bilayer, the of all the lipid molecules...Ch. 3 - The main function of the endomembrane system is...Ch. 3 - Enzymes contained in __________ break down...Ch. 3 - Put the following structures in order according to...Ch. 3 - No animal cell has a ______. a. plasma membrane b....Ch. 3 - Prob. 13SQCh. 3 - Prob. 14SQCh. 3 - Match each cell component with its main function.Ch. 3 - In a classic episode of Star Trek, a gigantic...Ch. 3 - Prob. 2CTCh. 3 - What type of micrograph is shown below? Is the...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Draw a sketch of a lipid bilayer, the structure that forms when a lipid such as phosphatidyl serine is dissolved in water.arrow_forwardWhich of the following is true about lipid bilayers? A. They are self-forming. B. They are dynamic. C. They are fluid. D. They are permeable. A, C, D only A, B, C only B, C, D only A, B, C, Darrow_forwardCell membranes consists mainly of ________ and ________ . a. lipids; carbohydrates c. lipids; phospholipids b. phospholipids; protein d. phospholipids; ECMarrow_forward
- What properties define the phospholipids that make up the lipid bilayer? Select all that apply. A. Nonpolar, hydrophobic hydrocarbon tails B. Polar, hydrophilic phosphate heads C. Nonpolar, hydrophobic phosphate heads D. Polar, hydrophilic hydrocarbon tailsarrow_forwardWhich of these is not a function of the lipid bilayer? A. Changes the temperature B. Provides a flexible matrix C. Imposes a barrier to permeabilityarrow_forwardWhich of the following are the main structural components of the lipid bilayer of all cell membranes? A. Phospholipids B. Waxes C. Triglycerides D. Steroidsarrow_forward
- A phospholipid is a biomolecule composed of a phosphate group that is bonded to two lipid chains. Which of the following correctly describes the nature of those two components? (a) The phosphate group is hydrophobic, and the lipid chains are hydrophilic. (b) Both the phosphate group and the lipid chains are hydrophilic. (c) Both the phosphate group and the lipid chains are hydrophobic. (d) The phosphate group is hydrophilic, and the lipid chains are hydrophobic.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_forwardWhich of the following is incorrect regarding phospholipids?a. The heads are polar.b. The tails are nonpolar.c. They contain a phosphate group in place of one fatty acid.d. They are energy-storage molecules in the cell.arrow_forward
- Phospholipids are important components of A. bacterial cell walls B. ribosomes C. carbohydrates D. steroid lipids E. lipid dropletsarrow_forwardSeveral students in our class always sit together in the front row. Suppose this could be because (i) they really like each other or (ii) nobody else in our class wants to sit next to them. a) Which explanation holds for the assembly of a lipid bilayer? Explain your answer. b) If the lipid bilayer assembled for the opposite reason, how would its properties differ?arrow_forwardIt seems paradoxical that a lipid bilayer can be fluid yet asymmetrical. Explain.arrow_forward
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