Which of the following statements is CORRECT about the fatty acid residues in membrane lipids?A. Whole swathes of the membrane have higher saturated residues to increase the overall surface tension.B. There are more unsaturated units to maintain the fluidity of the structure at all environmental temperatures.C. More unsaturated residues are present to increase the melting point of the membrane making it resilient.D. Larger quantities of saturated units are present to maximize stacking and provide effective barrier capacity.

All plasma membranes contain proteins and lipids as components. The basic structure of the plasma…

Answered: Which of the following statements is…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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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.
Write 2 (any) functions of membrane carbohydrates and explain the functions.
Fat is stored in adipose cells in the body, and glycoproteins are produced by liver cells. Which of the following is likely to be more prominent in adipose cells than in liver cells? A B с D cell membrane smooth endoplasmic reticulum nucleus rough endoplasmic reticulum
In general terms, what would you expect to be different about the permeability of a lipid bilayer made of phospholipids (modern cells) and a bilayer made of fatty acids (protocell)?
Consider the following diagram of the cell membrane. Which of the statements is NOT true regarding the cell membrane? Group of answer choices a. Proteins and carbohydrates are also components of the cell membrane. b. Certain phospholipids and proteins on the outer surface of the cell membrane are attached to carbohydrates. c. Some carbohydrates extend through the entire lipid bilayer and appear on both surfaces of the membrane d. Some of the proteins embedded in the cell membrane constitute channels (passage canals).
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?
Explain how the lipid bilayer modulate the activity of proteins. Give 2 examples.
Which of the following statements best explains the insolubility of lipids in water? a. The structure of lipids includes hydrophilic molecules. b. The polar portion of lipids is much larger than the nonpolar portion. c. The polar portion of lipids is much smaller than the nonpolar portion. d. The polar and nonpolar portions of lipids are of the same size.
Decide whether the following statements about phospholipids is correct below
Lipid bilayers form spontaneously in a process driven by the hydrophobic effect. Explain how the hydrophobic effect drives bilayer formation from individual lipids in an aqueous environment. Describe how the physical properties of the lipid bilayer are determined by the chemical properties of the membrane lipid components. Diagrams are encouraged for both parts of the question.
For biological membranes, which of the following statement is NOT true? A. The phospholipid bilayer is a fluid matrix. B. Protein can be anchored to the membrane by covalently linked lipid chains. C. Proteins can move laterally across the membrane. D. For organisms living in cold temperature, their cell membranes contain more triacylglycerols. E. Transverse motion of lipid molecules can occur occasionally. Enzyme lowers when... A. The energy difference between the substrate and the transition state B. The energy difference between the product and the transition state C. Both A and B D. Neither A nor B
Which of these general statements is TRUE about the lipid called phosphatidylcholine (or PC)? Group of answer choices PC is NOT an aminophospholipid. PC is zwitterionic at normal cell pH. PC resides mainly in the outer leaflet of the membrane bilayer. 3 of these 4 responses are correct PC is a type of cholesterol.

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