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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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 tails
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?
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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- cannot diffuse across a lipid bilayer. a. Water molecules b. Gases c. lons d. Nonpolar moleculesarrow_forwardWhich of the following molecules is not capable of forming lipid bilayers? a. glycolipids b. wax esters c. phospholipids d. cerebrosidesarrow_forwardDecide whether each of the following molecules will pass through a lipid bilayer. If the molecule will pass through, type yes it will. If the molecule will not pass through, type no it will not. a. Glucose b. Glycerol C.water D. Oxygen gasarrow_forward
- Which of the following is true about phospholipid bilayers?arrow_forwardPhospholipids are important components of A. bacterial cell walls B. ribosomes C. carbohydrates D. steroid lipids E. lipid dropletsarrow_forwardWhich of the following statements is/are incorrect? 1. The cell membrane is purely hydrophobic. 2. Glycerophospholipids have a phosphate derivative group that is known as the polar head group. 3. The individual glycerophospholipid molecules that aggregate become covalently linked to each other to form a lipid bilayer. 4. The interfacial region of a lipid bilayer is polar due to the polar head groups of the lipid molecules that make up the bilayer. O 1 and 3 O 1 only O 2 and 4 O 3 only O 4 onlyarrow_forward
- Which of the following are the main structural components of the lipid bilayer of all cell membranes? A. Phospholipids B. Waxes C. Triglycerides D. Steroidsarrow_forwardSome cytosolic proteins are anchored to the cell membrane via covalent bonds between cysteine or serine residues and _________ within the inner leaflet of the plasma membrane. A. GPI anchors B. cholesterol molecules C. lauric acid groups D. myristic acid groups E. palmitic acid groupsarrow_forwardPhospholipids are important components of__________.a. the plasma membrane of cellsb. the ring structure of steroidsc. the waxy covering on leavesd. the double bond in hydrocarbon chainsarrow_forward
- Why do phospholipids tend to spontaneously orient themselves into something resembling a membrane such as the lipid-bilayer sphere, single-layer lipid sphere, and lipid-bilayer sheet? a. Phospholipids are amphipathic molecules. The polar head faces towards water and the nonpolar fatty acid tails face towards other fatty acid tails. b. Phospholipids are lipophilic molecules. The polar head faces towards water and the nonpolar fatty acid tails face towards other fatty acid tails c. Phospholipids are amphipathic molecules. The nonpolar head faces towards other fatty acid tails and the polar fatty acid tails face towards water. d. Phospholipids are hydrophilic molecules. The polar head faces towards water and the nonpolar fatty acid tails face towards other fatty acid tails.arrow_forwardPhospholipids are important components of __________. a. the plasma membrane of cells b. the ring structure of steroids c. the waxy covering on leaves d. the double bond in hydrocarbon chainsarrow_forwardPositively 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.arrow_forward
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