To possess optical activity, a compound must be: Which of the following statemen

Question

To possess optical activity, a compound must be: Which of the following statements about starch and glycogen is false? 86. 81. A. Amylose is unbranched; A. a carbohydrate B. a hexose. C. asymmetric. D. colored. E. D-glucose. amylopectin and glycogen contain many (al 6) branches. Both are homopolymers of glucose. Both serve primarily as structural elements in cell walls. Both starch and glycogen are stored intracellularly as insoluble granules. Glycogen is more extensively branched than starch. B. C. D. E. When the linear form of glucose cyclizes, the product is alo): 82. A. anhydride. B. glycoside. C. hemiacetal. D. lactone. E. oligosaccharide. 87. A major component of RNA but not of DNA is: A. adenine. B. cytosine. C. guanine. D. thymine. E. uracil. 83. When two carbohydrates are epimers: one is a pyranose, the other a furanose. one is an aldose, the other a ketose. they differ in length by one carbon. they differ only in the configuration around one carbon atom. they rotate plane-polarized light in the same direction. A. B. C. D. The difference between a ribonucleotide and a deoxyribonucleotide is: 88. a deoxyribonucleotide has an-H instead of an--OH at C-2 a deoxyribonucleotide has configuration; ribonucleotide has the configuration at C-1 a ribonuclcotide has an extra -OH at C-4 a ribonucleotide has more structural flexibility than deoxyribonucleotide a ribonucleotide is a pyranose, deoxyribonucleotide is a furanose A. E. B. From the abbreviated name of the compound Gal(Bl 4)Glc, we know that: 84. C-4 of glucose is joined to C-1 of galactose by a glycosidic bond. the compound is a D-enantiomer. the galactose residue is at the reducing end. the glucose is in its pyranose form. the glucose residue is the anomer. A. C. B. C. D. D. E. E. 85. Starch and glycogen are both polymers of A. fructose. B. glucosel-phosphate. C. sucrose. D. a-D-glucose. E. B-D-glucose.

Explanation / Answer

81) assymetric

82) hemiacetal

83) they differ only in the configuration around one carbon atom

84) C-4 of glucose is joined to C-1 of galactose by a glycosidic bond

85) alpha D glucose

86) both serve primarily structure in cell wall

87) uracil.As in DNA thymine is present

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