Which of the following statements is/are true?1. Sphingolipids all have a palmitate derivative that is ester-linked to the sphingosine backbone.2. The addition of cholesterol will always lead to an increase in the rigidity of a lipid bilayer.3. Glycolipids may have a sphingosine or a glycerol backbone to which a sugar moiety is attached.4. All lipid molecules are characterized by the presence of a carboxylic acid functional group.O 1 and 2O 1 onlyO 2 and 3O 3 onlyO 1,3, and 4

Lipids are one of the most biologically important macromolecule. While it is not a polymer (composed…

Answered: Which of the following statements…

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter2: Chemistry Of Life

Section: Chapter Questions

Problem 10RQ: Phospholipids are important components of_______. a. the plasma membrane of cells b. the ring...

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Amylopectin and cellulose are being compared. Which of the following choices explains the similarity between the polysaccharides? Both contain 1,4-glycosidic bonds O Both function as membrane components. O Both contain a-peptide bonds. Both have extended linear shapes.
Cholesterol ( see picture) has a fused four – ring core and is part of body membranes. The -OH group on C-3 is the polar head, and the rest of the molecule provides the hydrophobic tail that does not fit into the zigzag packing of the hydrocarbon portion of the saturated fatty acids. Considering this structure, does cholesterol contribute to the stiffening (rigidity) or the fluidity of a membrane? why or why not?
Sphingolipids do I. contain a glycerol core with a phosphocholine headgroup. II. contain a modified sphingosine. III. usually has a ceramide moiety IV. function as a precursor to sterols. O II, IV O II, II O , II, II O I, II, IV
H "H H H HO Choose all of the following are true of the given structure? (Choose all of the correct answers)
Cholesterol ( above below ) has a fused four – ring core and is part of body membranes. The -OH group on C-3 is the polar head, and the rest of the molecule provides the hydrophobic tail that does not fit into the zigzag packing of the hydrocarbon portion of the saturated fatty acids. Considering this structure, does cholesterol contributes to the stiffening (rigidity) or the fluidity of a membrane? Why or why not?
The following structure is a glycerophospholipid. a. Circle & label the 4 parts of the molecule: fatty acids (2), glycerol, phosphate, & amino alcohol. CH,- 0 - Č - (CH,),CH, CH - 0 -Č- (CH,),CH, CH, CH,- 0 - P - 0 - CH,- CH,- N° - CH, b. Which part of the molecule is considered nonpolar (hydrophobic)? (fatty acids, glycerol, phosphate or amino alcohol)
(a) Cholesterol is a lipid yet does not form membranes like the membrane lipids and is not used to store energy like the storage lipids. Explain. b) Glycerophospholipids and sphingolipids form membranes but triacylglycerols do not. Why? (c) Triacylglycerols are used for long term energy storage but glycogen and starch are used for short term energy storage. Explain
Which of the following statements regarding lipids is most accurate? 1. Lipids are synthesized by ribosomes 2. Saturated fats tend to be solid at room temperature because of the polar hydrocarbon chains 3. Saturated fats tend to be liquid at room temperature due to hydrogen bonding 4. Polyunsaturated fats tend to be liquid at room temperature due to numerous double bonds in the hydrocarbon chains 5. The empirical formula for lipids is typically C1H201
Match lipid descriptions in column A with the phospholipid types in column B. H is attached to the phosphate group bound to C3 of glycerol backbone An amino acid is attached to the phosphate group bound to C3 of glycerol backbone A primary ammonium ion is found in its structure A quaternary ammonium ion is found in its structure A. phosphatidylethanolamine B. glycerophospholipid C. phosphatidylcholine D. phosphatidylserine
Which of the following is true of sphingolipids? They always contain glycerol and fatty acids. They may be charged, but are never amphipathic. They contain two esterified fatty acids. Phosphatidylcholine is a typical sphingolipid. The sphingosine backbone is O-linked to a head group.
The following is a block diagram for a glycerophospholipid where the building blocks are labeled with letters and the linkages between building blocks are labeled with numbers. ____________ 5. Which building blocks are glycerol residues? ____________ 6. Which building blocks are phosphate residues? ____________ 7. Which linkages involve an alcohol residue? ____________ 8. Which linkages involve both glycerol and fatty acid residues?
Two different membrane components are shown in the figure below. HO B A CH3 choline head group C glycerol backbone H3C D hydrocarbon tail CH3 CH3 CH3 B- C- D CH₂ 0 CH3 O CH3 C=O C=O CH-CH₂ What are the molecular modules indicated by the letters A-D? Select from the two options provided for each module. Asterol polar head group CH₂ CH₂ O CH3

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