Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 3.2, Problem 1TQ
Summary Introduction
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The reason behind amino acids not being membrane-permanent weak bases or weak acids along with the reason for their failure in crossing the phospholipid bilayer.
Introduction:
Acid and base are the chemical substances that donate and receive hydrogen ions, respectively. Alkalinity and acidity of any substance are determined by the pH, a logarithmic scale. The acids and bases dissolve in water for the yielding of hydronium and hydroxide ion, respectively. The
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Microbiology: An Evolving Science (Fourth Edition)
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- Why is it advantageous for the cell membrane to be fluid in nature?arrow_forwardThe tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobicarrow_forwardUsing the answer code on the right, indicate which membrane component is responsible for the function in question: 1. channel formation____________________________________ (a) lipid bilayer 2. barrier to passage of water- __________________ (b) proteins soluble substances ____________________________________ (c) carbohydrates 3. receptor sites 4. membrane fluidity 5. recognition of self 6. membrane-bound enzymes 7. structural boundary 8. carriersarrow_forward
- Which plasma membrane component can be either found on its surface or embedded in the membrane structure? a. protein b. cholesterol c. carbohydrate d. phospholipidarrow_forwardA phospholipid bilayer with equal amounts of saturated and unsaturated fatty acids displays a specific permeability to glucose. What effect will increasing the proportion of unsaturated fatty acids in the bilayer have on the membrane's permeability to glucose?arrow_forwardLipid bilayers are said to behave like two-dimensional fluids. What does this mean? What drives the movement of lipid molecules and proteins within the bilayer? How can such movement be measured? What factors affect the degree of membrane fluidityarrow_forward
- . Cholesterol is an integral part of plasma membranes. Based on its structure, where is it found in the membrane? On the extracellular surface embedded with the phospholipid heads within the tail bilayer attached to the intracellular surfacearrow_forwardWhat is the cause of the impermeability of plasma membranes to water-soluble molecules? Group of answer choices the nonpolar nature of water presence of phospholipid bilayer with a nonpolar/hydrophobic interior region presence of transmembrane proteins the presence of cellulosearrow_forwardWhat enzymes are responsible for distributing phospholipids in the correct side of the membrane?arrow_forward
- There is a long chain of amino acids with long sections that are mostly polar, alternating with long sections that are nonpolar. How would this chain be organized if it were destined to become a transmembrane protein? A cytoplasmic protein?arrow_forwardWould substances be able to pass through the plasma membrane if the phospholipid tails of the plasma membrane were both saturated fatty acids? Explain why or why not?arrow_forwardPart a) Would a single alpha helix be more stable in a aqueous solution or a membrane. Explain why. Part b) Why do transmembrane proteins always have secondary structures inside the membrane but aqueous proteins do not? Part c) If you had a single alpha helix, can it act as a pore for a membrane. Explain.arrow_forward
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