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11-Select the incorrect statement below about denaturation. A. Denaturation may refer to a structural change in macromolecules caused by extreme conditions B. Denaiuration includes structural alteralions due lo desuruction of the chemical bonds hoiding proteins in a three-dimensional form. C. Denaturation differs from hydrolysis in that in hydrolysis the protein is broken down into smaller peptides or amino acids D. Denaturation does not alter primary structure, but only the higher levels of structure of proteins E. none of the above F. A and DS only 12. Which of these agents will denature a protein? A. Temperature B. Heavy metals C. Delergents D. Organic Solvents E. Mechanical Stress F. All of the above 13- Which of these statements are FALSE with respect to the chemical properties ofr monosaccharides? A- Because the cyclic and linear forms of aldoses and ketoses interconvert, these sugars undergo reactions typical of aldehydes and ketones. B. The aldehyde group of an aldose can be oxidized to a carboxylic acid. C. The carbonyl group in both an aldose and ketose can be reduced to give a hydroxyl group. D- all of the above E-none of the above 14- Which of these carbohydrates are NOT reducing sugars? A- amylase B- glucose C- galactose D-fructose E- sucrose F- neither A or E 15. Which of these statements is false? A. All disaccharides are reducing sugars B. Most disaccharides are reducing sugars, except sucrose C. Sucrose does not react with Fehlings reagent because the anomeric carbon of glucose is involved in the glucose- fructose bond and hence is not free to form an aldehyde in solution that can be oxidized. D. Sucrose does not react with Fehlings reagent because since it no longer has an anomeric carbon with a free potential aldehyde or ketone group, it can no longer exhibit reducing properties E. none of the above

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