21. Which statement characterizes uronic acids? A) Aldoses where the aldehyde ha
ID: 202941 • Letter: 2
Question
21. Which statement characterizes uronic acids? A) Aldoses where the aldehyde has heen oxidized to a carhoxylic acid B) Aldoses where the primary alcohol has been oxidized to a carboxylic acid. C) Aldoses where the aldehyde is reduced to an alcohol. D) Aldoses where the primary alcohol has been oxidized to an aldehyde 22.-.. cannot be broken down by mammalian digestive enzymes. A) cellulose B) amylopectin C) amylose D) glycogen E) starch 23. Which one of these characteristics is true for the helix? A) It is a coiled coil B) There are 3.5 amino acids per turn C) There is a requirement for glycine every third amino acid residue D) A hydrogen bond forms between the carbonyl oxygen of the nth amino acid residue and the NH group of the (n + 4)th amino acid residue E) Prol ines are often found within an helix. 24. Characteristic properties of cholesterol include: A) disruption of membrane upon incorporation B) high water solubility C) fast breakdown with UV light. D) a precursor to steroid hormones. E) None of these 25. Without ascorbic acid you are unable to oxidize residues in collagen, resulting in scurvy A) protamine B) glycine C) proline D) lysine E) hydroxylproline 26. Of those amino acids pairs listed below, the interaction of the chain would have the least influence on protein stability A) Arg, Glu B) Asp, Lys C) Lys, Glu D Asp, Arg side change with theside E) Leu, Ile 27. The following statement characterizes cellulose A) linear polymer of glucose with (14) linkages B) linear polymer of glucose with (14) linkages C) linear polymer of galactose with ( 14) linkages D) linear polymer of galactose with ( 14) linkages 28. Which of these polysaccharides adopts a helical conformation? A) -amylose B) chitin Cspiralulose D) lignin E) cellulose 29. Which of the following is a way that the low pH found in the gut can enhance the digestibility of dietary protein? A) disulfide reduction D) protein structure denaturation E amide hydrolysis B) salt bridge formation C) cysteine oxidation F) carboxy-terminus protonation 0. When comparing similarities among multiple protein structures, which of the following is false? A) Proteins with similar motifs are likely to perform similar functions B) An effective protein motif is likely to be observed in multiple proteins. C) Proteins with the same function from a different species are likely to have similar motifs. D) Proteins with similar sequences tend to adopt different backbone conformations E) None of the above statements are falseExplanation / Answer
21. The correct option is B) Aldoses where the primary alcohol has been oxidized to a carboxylic acid.
Uronic acid is a class of sugar acids with both carbonyl and carboxylic acid functional groups.
22. The correct option is A) Cellulose.
Most animals can't digest cellulose because it is very difficult to break down.
23. The correct option is A) It is a coild-coil.
Coiled-coil helices are highly stable forms in which two or more helices wrap around each other in a supercoil structure.
24) The correct option is D) a precursor to steroid homones.
Cholesterol acts as a precursor for the biosynthesis of steroid hormones, bile acid and vitamin D.
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