1. Differentiate starch from cellulose and carb 2. In which solvents or solutions will a lipid be a. CH2CI2 b. 5% aqueous NaCl solution c. CH3CH2CH2CH2CH3 3. List the physical properties of fats and oils a
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- 1. Draw the structures of triacylglycerol, cholesterol, phosphatidylcholine, and sphingomyelin. 2. Identify the polar/charged groups and draw how water will orient itself around these groups. 3. Order these lipids from most hydrophobic to most hydrophilic. 4. Predict how the lipids will migrate on the TLC plate when the running buffer is an organic solvent. Keep in mind that although the lipid standards are dissolved in organic solvent, they can (by virtue of their polar/charged groups) interact with the polar silica matrix of the TLC plates.4. Identify the membrane lipids and describe their structures and roles. 5. Which is more hydrophilic, cholesterol or phospholipids? Defend your answer. 6. Why does the introduction of double bonds into a fatty acid molecule lower its melting point? 7. Identify the fatty acids present in each of the following triacylglycerols.Match the following descriptions with the correct lipid-based compounds: Cholesterol Sphingolipids Phosphoacylgycerol Glycerophospholipids Fatty acyls…
- 1. Heat enhances hydrogen bonds, ionic interaction and hydrophobic bonds among the amino residues in a protein.* 1 point The statement is CORRECT. The statement is INCORRECT. 2. Which of the following statements is TRUE for fats and oils?* Fats need more volume of bromine to reach endpoint due to higher degree of unsaturation. Oils need more volume of bromine to reach endpoint due to higher degree of unsaturation. Fats and oils need the same volume to reach endpoint due to same degree of unsaturation. None of the choices5) Describe the three areas of focus for reducing cholesterol in the body. 6) Complete the table below with the 5 major groups of lipids (based on combining Lipids Video 1 and Video 2) including a description of their basic structure, an example of each, and the function specific to the example you have provided. Type of Lipid Basic Structure Example Function1. Draw the structure of phosphatidic acid. Circle the polar parts of the molecule and box the non-polar parts of the molecule. 2.Based on the structure why would this molecule be a major building block for glycerophospholipids that make up the cell membrane? In your answer include which part of the molecule would be inside the membrane and which one out and why. 3. What specific “effect”would drive your answer to 2?
- Lipids most abundant form are Triglycerides building blocks are 1 If a triglyceride only contains If a triglyceride contains one or more unsaturated fat. + The tail of this structure is made of 2 (hydrophobic). then it is classified as a saturated fat. The head of this structure is made of a single (hydrophilic). 4+ O Search Lipids are also responsible for a major component of the cell membrane wall that is both attracted to and repelled by water, called Their overall shape determines their The complex 3D shape of a protein is called a Proteins have four levels of structure: t -Ö:-- CD and 3 per molecule. bonds that contain the maximum number of + Proteins building blocks are amino acids that are held together with bonds. These are covalent bonds that link the amino end of one amino acid with the carboxyl end of another. T 09 bonds, then it is classified as an that are water insoluble + that is water soluble T F9 8 W F10 · C F111. Melting point: what happens when the carbon chain length of fatty acids become shorter? increased melting point decrease melting point no change 2. Why do lipids with long chain fatty acids have lower saponification value? they are linear in structure, thus it is difficult to saponify they have lower number of carboxyl group per 1 gram of sample they require less amount of KOH during titration they require less HCL during back titration 3. Halogenation depends on which concept? presence of double bond in the glycerol portion presence of double bond in the fatty acid portion presence of carboxylic acid groups reactivity of potassium ionssterols, which help to maintain their fluidity. 5. Which form a more rigid lipid bilayer: lipids containing mostly saturated fatty acids or lipids containing mostly unsaturated fatty acids? Explain.
- function and identify their chemical structure. 1. What are the different classes of lipids? State their 2. Identify whether the following fatty acids are saturated or unsaturated. a. CH3(CH2)sCH=CH(CH2)7COOH b. CH3(CH2)¬CH=CH(CH2)7COOH c. CH3(CH2)10COOH do d. CH3(CH2)16COOH e. CH;CH2(CH=CHCH2)3(CH2)6COOH 3. Explain the importance of lipid content in the structure of biological membranesTrue or False: 1. Lipids in a lipid bilayer spin rapidly around their long axis. 2. Lipids in a lipid bilayer rapidly exchange positions with one another in their own monolayer. 3. Lipids in a lipid bilayer do not flip-flop readily from one lipid monolayer to the other. Hydrogen bonds that form between lipid head groups and water molecules are continually broken and re-formed. 4. 5. Margarine contains more saturated lipids than the vegetable oil from which it is made. 6. Some membrane proteins are enzymes.Multiple Choice: Read each question carefully and select the best answer. 1. When will a protein have the lowest solubility? A. when the pH is above the isoelectric point B. when the pH is below the isoelectric point C. at neutral pH D. at isoelectric pH 2. Which of the following is true of proteins? A. all proteins are acidic B. all proteins are basic C. all proteins are neutral D. the acid/base properties of a protein depend on the identity of its side chains _3. Which of the following correctly describes relationship between the primary structure of a protein and protein function? A. changing one amino acid always affects protein function B. only when changing more than one amino acid will have an affect protein function C. changing one amino acid never affects protein function D. there is no relationship between primary structure and protein function for the next 7 items, refer to the figure below: 2 Cyst - Tyr 8 3 4 Ile - Gln - Asn - Cyst - Pro - Leu - Gly - NH: 6 9 Охytocin…