Which is NOT a feature of a fatty acid? Even numbers of carbon atoms Can be saturated or unsaturated Straight chain with no branching Double bonds can be conjugated
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30. Which is NOT a feature of a fatty acid?
- Even numbers of carbon atoms
- Can be saturated or unsaturated
- Straight chain with no branching
- Double bonds can be conjugated
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- Amylose is comprised of glucose monomers connected by what kind of glycosidic bond? a (1 -->4) a (1 --> 6) b (1 --> 4) b (1 --> 6) None of the aboveWhich statement about the glycoprotein shown below is true? OH CH₂OH OH HN HN-C =0 CH3 H₂ Protein CH N-H Protein It contains a deoxyribose sugar that could be metabolized by human enzymes. O The monosaccharide is attached to the protein via nitrogen in a residue's a-amine. It contains a ribose sugar that could not be metabolized by human enzymes. The monosaccharide is attached to the protein via nitrogen in a residue's side chain.A22. Which ONE of the following statements regarding biological molecules is CORRECT? (A) The monosaccharide glucose is predominately in the linear form in aqueous solution. (B) (C) (D) (E) Disaccharides consist of two monosaccharide units linked by an ester bond. Starch is a polymer of glucose units held together by the formation of acetal bonds. Peptides are formed from a number of amino acids bound together through their side chain groups. Peptides and proteins are held together by imine bonds.
- Long chains of beta glucose monomers are held together in microfibril bundles by bonds Vanderwaals Interaction ionic covalent hydrogen In a fat molecule a glycerol is covalently bonded to fatty acid tails by a glycosidic link a hydrogen bond an ionic bond an ester link If the R group of an amino acid is nonpolar, it probably consists of one or more methyl groups hydroxyl groups amino groups hydrophilic groups16. A saturated fatty acid has how many double carbon bonds in the backbone carbon chain? (11. Make a series (at least 3) of drawings to show the three dehydration synthesis reactions that take place between the two Fatty Acids, the Phosphate Head and the Glycerol. Show the water molecules made. a) Label the following on the completed phospholipid: hydrophilic and hydrophobic parts of the molecule, fatty acids, phosphate group, and glycerol. b) Compare the structure of the phospholipid to that of a triglyceride. How are the two molecules Similar? How are they different? 2. Use the following vocabulary to label and draw a cell membrane: cytoplasm (cell lumen) extra-cellular fluid hydrophobic hydrophilic polar head non-polar tails a) How many O-H groups are there? And are the O-H areas of sucrose polar or non-polar? b) What is the term that is used to discuss how tightly or loosely an atom's nucleus has a hold of its valence electrons?
- 1. What is the chemical formula for palmitic acid and oleic acid? Which one is a saturated fat and which one is an unsaturated fat? How do you know? 2. What functional groups are involved in dehydration synthesis reactions to form a triglyceride? What is the waste product? 3. Compare the overall acidity of the molecules before and after the formation of a triglyceride. Proteins 1. What gives each amino R group its key characteristics to make it polar, non-polar, or ionic? 2. What functional groups are involved in dehydration synthesis? 3. How might the solubility of peptides be influenced by the size of the peptides? How might the R group of the amino acid influence it? 4. Would you consider the formation of a peptide bond to be an example of a neutralization reaction? Explain your reasoning.Which of the following might be a feature(s) of a lipid that has been converted from a fully saturated fatty acid to a fatty acid containing several trans double bonds? Select all that apply. The trans fatty acid will now have a higher melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack more closely with saturated fatty acids, than with unsaturated fatty acids containing cis double bonds The trans fatty acid will now have a lower melting temperature compared to the fully saturated precursor The trans fatty acid will be able to pack most closely with unsaturated fatty acids containing cis double bonds, than with saturated fatty acidsWhich of the following properties of a free fatty acid molecule would make it capable of producing the most energy when used as a fuel source, compared to other free fatty acids? a) A large number of unsaturated bonds b) Shorter hydrocarbon chain with a large number of carbonyl groups c) Longer hydrocarbon chain with a large number of saturated bonds d) Shorter hydrocarbon chain with a large number of saturated bonds
- 1. (a) Arrange the following lipid molecules in the order of their relative melting points. Н.С — о-С-R Н.С — о-С-R H,C -0-ć- | НС —0—С-R НС —о-с-R' НС —о-с-R" H2C -0-Ċ-R H2C -0-C-R H2C -0-ċ-R" VI VII VIII (-olx). 0-ċ-R 180 —о-с-R 18-1 cisÃ9 -ċ-R") = 18:1transA9 (b) Give your reasons for your answer. (c) On heating lipid VI with aqueous NAOH, all the ester linkages were hydrolyzed. Draw the structure of each product of the hydrolysis. (e) Giving a reason for your answer, predict what would happen to the solubility of these products in water if, after the hydrolysis, excess acid was added to the medium to acidify it.The figure below illustrates the molecular structures of two fatty acids. A B H₂C The structural formula of erucic acid and behenic acid с H₂C D erucic acid behenic acid Which of the following best explains why erucic acid is liquid at room temperature but behenic acid is solid at room temperature? O OH The presence of a double carbon to carbon bond in erucic acid prevents the molecule from packing closely together. The lack of any double carbon-carbon bonds in behenic acid causes the molecule to be come polar and therefore packed more tightly. The larger number of carbon atoms in erucic acid prevents the molecule from packing tightly together. OH The smaller number of carbon atoms in behenic acid creates stronger covalent bonds between the carbon atoms allowing for them to pack more tightly together.Trans-fatty acids are synthetic forms of fatty acids made from altered unsaturated fatty acids. Trans-fatty acids are denser, solid at room temperature, and store more energy in the same unit of volume than unsaturated fatty acids. The production of trans-fatty acids involves the reorientation of one of the hydrogen atoms attached to a double-bonded car- bon atom, as illustrated in the figure below. unsaturated fatty acid OHHHHH HOC CCCC-c II I I HHHH trans-fatty acid |||| Molecular model of an unsaturated and trans-fatty acid Based on the structures shown above, H -C-C-C-C-C-H HHHHH TTTTT !!!!! HHHHH OHHHHH | ! ! ! ! ! HO-C-C-C-C-c-c IIII HHHH H HHHHH H HH III C-C-C-H I (a) Identify one property of all fatty acids. (b) Describe one of the functions of fatty acids in living systems. (c) Explain how the reorientation of the hydrogen atom as shown in the image allows the trans- fatty acids to be denser and solid at room temperature. Respond to each part in 3 to 5 complete sentences.
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