N 3 13 Which of the following lipid is likely to function as membrane lipid in mammals. O tripalmitin gangliosides Wax O Phosphatidyl choline arachidonic acid + Click Save and Submit to save and submit. Click Save All Answers to save all answers
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- A group of BS Biology students were tasked to design and fabricate different synthetic cell membranes that could be used to simulate cellular activities of certain organisms. Below are the chemical structures of the compounds that are available to them: H2C-OH НС — ОН HO H2C-OH myristic acid glycerol НО alpha-linolenic acid HO-P-o OH orthophosphate HO NH2 sphingosine OH CH2OH NH3 CH2OH HO ethanolamine HO OH OH OH Но. lactose ("point of attachment) Given these compounds, help the students assemble the structure of the lipid constituent for the cell membrane appropriate to study the following. Briefly explain your answer. (Draw the structure) а. a thermophilic bacteria thriving in a hot spring b. a hepatocyte of a sea lion in the Arctic Ocean С. a frog neurocyteLipoprotein particles (Figure 3.18) are spherical clusters of protein and lipid molecules that circulate in the blood of animals and are rather substantial in size (see Figure 3.11). They function similarly to suitcases, transporting cholesterol, fatty acid residues, triglycerides, and phospholipids from one location in the body to another throughout the body. In light of your knowledge of lipid insolubility in water, which of the four types of lipids would you expect to be on the exterior of a lipoprotein clump that is bathed in the water-based fluid part of blood?A common structural feature of membrane lipids is their amphipathic nature. For example, in phosphatidylcholine, the two fatty acid chains are hydrophobic and the phosphocholine head group is hydrophilic. Complete the table by identifying the components that serve as the hydrophobic and hydrophilic units for each membrane lipid.
- Determine whether each of the amino acids is polar, nonpolar, positively charged, or negatively charged at pH 7. Polar and neutral aspartate H Ser H₂N-C-CH₂-C-COO NH3 lysine Leu Nonpolar Answer Bank H OOC-CH₂-CH₂-C-COO NH3 Positively charged H CH₂-C-COO NH3 hydrophobic amino acids Negatively chargedCholesterol 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, tell whether cholesterol contributes to the stiffening (rigidity) or the fluidity of a membrane.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?
- Which of the following lipids would you expect to find as a structural component in a membrane, and with a net charge of zero at pH 7.3? phosphatidylserine. triacylglycerol. phosphatidylcholine. phosphatidic acid none of the above options.1 3 6 HO-C-H CH₂OH c=0 H-C-OH I H-C-OH CH₂OH H Н Н N-C-C CH =0 он HC CH2 CH3 4 но TII H2N-C-C-ОН 7 CH2 | ОН CH₂OH ОН о о ОН ОН 8 5 2 0 0=P-0 о NH₂ N OHCholesterol ( 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?
- Polar and neutral HO H OOC-CH₂-CH₂ C-COO NH3 NH3 CH₂-CH-C O Nonpolar hydrophobic amino acids Met lysine Answer Bank aspartate Positively charged Ser Negatively charged H H3C-C-COO NH3Which of the following statements is true In ABO blood typing, lack of glycosyltransferase and galactosyltransferase produces AB blood group O Lipid compositions of membrane mono-layers are symmetrical O Unsaturated fatty acids have double bond(s) in the cis configuration O Sphingomyelin posses phosphoryl serine in addition to two long hydrocarbon chains, one contributed by a fatty acid and the other by sphingosineMatch each of the statements below with the fibrous protein that mostly fits the description. Coiled-coil of alpha helices V [ Choose] Collagen Silk fibroin Keratin Triple helical arrangement of polypeptide chains Extended anti-parallel beta sheets [ Choose ] Characterized by a predominant (GSGAGA)n repeat in the primary seguence [ Choose] Found in hair, feathers, scales, and nails [ Choose ] Is produced by insects and spiders [ Choose ] The sequence Gly-Pro-Hyp occurs frequently in this fibrous protein [ Choose ] Is characterized by the heptad pseudo- [ Choose ] repeat Major component of skin, tendons, ligaments and teeth [ Choose ] Characterized by regular inter-sheet spacing [ Choose ] of 0.35 and 0.57 nm