Microbiology: A Systems Approach
5th Edition
ISBN: 9781259706615
Author: Marjorie Kelly Cowan Professor
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 2, Problem 1CTQ
Support or refute the following statement: “Double bonding provides the plasma membrane with flexibility.”
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Support or refute the following statement: “Double bonding provides the plasma membrane with flexibility.”
For the lipids within the bilayer that
comprise the plasma membrane:
O The hydrophilic ends face outside
(extracellular/exoplasmic face) and inside
(cytoplasmic face) of the cells, with
hydrophobic ends buried in the center of
the lipid bilayer.
The hydrophobic ends face outside
(extracellular/exoplasmic
face) and inside
(cytoplasmic face) of the cells, with
hydrophilic ends buried in the center of the
lipid bilayer.
The hydrophilic ends face the outside
(extracellular/exoplasmic face) of the cells
and the hydrophobic ends face inside
(cytoplasmic face) of the cells.
O Hydrophobic and hydrophilic ends face
outside (extracellular/exoplasmic face) and
inside (cytoplasmic face) of the cells
randomly.
The hydrophobic ends face the outside
(extracellular/exoplasmic face) of the cells,
the hydrophilic ends face inside
(cytoplasmic face) of the cells.
True or False: In most cells, the lipid molecules that form the cell membrane bond to one another to form a firm, impermeable sheet.
Chapter 2 Solutions
Microbiology: A Systems Approach
Ch. 2.1 - Explain the relationship between atoms and...Ch. 2.1 - Prob. 2AYPCh. 2.1 - Prob. 3AYPCh. 2.1 - Prob. 4AYPCh. 2.2 - Prob. 5AYPCh. 2.2 - Provide examples of cell components made from each...Ch. 2.2 - Prob. 7AYPCh. 2.2 - Prob. 8AYPCh. 2.2 - Name the nitrogen bases of DNA and RNA.Ch. 2.2 - Prob. 10AYP
Ch. 2.3 - Recall three characteristics common to all cells.Ch. 2 - The smallest unit of matter with unique...Ch. 2 - The ____ charge of a proton is exactly balanced by...Ch. 2 - Electrons move around the nucleus of an atom in...Ch. 2 - Bonds in which atoms share electrons are defined...Ch. 2 - Prob. 5MCQCh. 2 - Prob. 6MCQCh. 2 - Prob. 7MCQCh. 2 - Prob. 8MCQCh. 2 - DNA is a hereditary molecule that is composed of...Ch. 2 - Prob. 10MCQCh. 2 - Prob. 11TFCh. 2 - Prob. 12TFCh. 2 - Prob. 13TFCh. 2 - Prob. 14TFCh. 2 - Membranes are mainly composed of macromolecules...Ch. 2 - Support or refute the following statement: Double...Ch. 2 - Prob. 2CTQCh. 2 - Plant cell walk are composed of cellulose, a...Ch. 2 - Compare and contrast the kinds of chemical bonding...Ch. 2 - Prob. 5CTQCh. 2 - Prob. 1VCCh. 2 - Prob. 1CM
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- Many transmembrane proteins are oligomeric, with several identical subunits. The oligonmers are usually found to have some form of C, symmetry, rather than D, or any higher order. Suggest a reason for this observation.arrow_forwardIt seems paradoxical that a lipid bilayer can be fluid yet asymmetrical. Explain.arrow_forward“Plasma membrane is described as protein iceberg in sea of lipids”. why ?arrow_forward
- True or False: Beta sheets are helical structures please explain the answer, thanksarrow_forward(a). Phospholipids are amphipathic molecules which have hydrophilic and hydrophobic regions. Explain how this feature benefits the cell. (Give ONE reason) (2) (b). Give ONE difference between a saturated phospholipid and an unsaturated phospholipid. (2)arrow_forwardProteins associate with membranes in a number of different ways. identify them and outline their molecular basis.arrow_forward
- TRUE or FALSE: Eukaryotic cells feature membrane bound organelles that create specialized compartments within a single cell. The primary structure of the outer cell membrane is a double layer but the membranes that enclose organelles are only single layer. Choose. 1. Which of the following is one of the ways that will keep the membranes of such vegetables to remain fluid when it is extremely cold? A) by increasing the percentage of unsaturated phospholipids in the membrane B) by decreasing the number of hydrophobic proteins in the membrane C) by increasing the percentage of cholesterol molecules in the membrane D) by co-transport of glucose and hydrogen 2. After a membrane freezes and then defrost, it often turns out to be loose to solutes. The best logical reason for this is that: A) the lipid bilayer loses its fluidity when it freezes. B) transport proteins become nonfunctional during freezing C) the integrity of the lipid bilayer is broken when the membrane freezes D) the…arrow_forwardMost cytoplasmic proteins lack disulfide bonds, whereas extracellular proteins usually contain them. Why?arrow_forwardOf the following cell membrane lipids, which one 1) prefers to reside in the inner leaflet (or inner half) of the membrane bilayer, AND 2) is not zwitterionic at physiological pH (7.4)? 1. SM (sphingomyelin) is inner-leaflet & NOT zwitterionic 2. PC (phosphatidylcholine) is inner-leaflet & NOT zwitterionic 3. PS (phosphatidylserine) is inner-leaflet & NOT zwitterionic 4. 2 of these 3 responses are correctarrow_forward
- Heating collagen, a water-insoluble fi brous protein, forms the jelly-like substance called gelatin. Explain how this process may occur.arrow_forwardThe composition of lipids in the outer and inner monolayers of a cell membrane are usually asymmetrical; i.e., different in each monolayer. twice as concentrated in the inner monolayer as in the outer monolayer. highly random for each monolayer. 89 identical in each monolayer. the same for all cell plasma membranes but different from the composition in mitochondrial and chloroplast membranes.arrow_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_forward
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