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Question 1
3 / 3 pts
Question 2
3 / 3 pts
CHEM 210 Biochemistry Module 4 Exam Portage
Learning Questions and Verified Answers, 100% Pass
Which of the following monosaccharides is a ketose? Dihydroxyacetone Galactose Glucose Glyceraldehyde Idose Dihydroxyacetone 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 about one carbon atom They react differently with iodine THEY DIFFER ONLY IN THE CONFIGURATION ABOUT ONE CARBON ATOM Which pair is anomeric? A) D-glucose and D-fructose B) D-glucose and L-fructose C) D-glucose and L-glucose D) - D-glucose and - D-glucose E) α-D-glucose and β-L-glucose D) - D-glucose and - D-glucose
Question 4
3 / 3 pts
Question 7
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Question 8
3/ 3 pts Which statement about starch and glycogen is false? A) Both have β-D-glucose monomers B) Both starch and glycogen are energy storage polysaccharides C) Both are homopolymers of glucose D) Glycogen is more extensively branched than starch E) Both have O-glycosidic linkages A) Both have β-D-glucose monomers Which monosaccharide is not a six-carbon monosaccharide? Fructose Ribose Mannose Galactose Glucose RIBOSE The two monosaccharides shown below could best be described as:
Question 9
3 / 3 pts Anomers Aldoses Ketoses Epimers Pentoses EPIMERS Which arrow correctly identifies the atom that will become the anomeric carbon?
Question 11
3 / 3 pts B The following monosaccharides are covalently bonded. What type of bond unites them? A) α1 → 4
Question 12
0 / 3 pts
Question 13
3 / 3 pts B) α1 →β C) 1, 4 D) α1 → 6 E) β1 → 6 D) α1 → 6 Which statement about cellulose is true? Cellulose is the primary storage polysaccharide of animal cells Cellulose is a highly branched polysaccharide Cellulose is a homopolysaccharide The glucose residues of cellulose contain the same configuration as the glucose residues of amylose Cellulose is an anomer of chitin CELLULOSE IS A HOMOPOLYSACCHARIDE The polysaccharide cellulose is most chemically similar to: Glycogen Dextrose Glycogen Chitin Starch
Question 17
3 / 3 pts
B. C 7 H 10 O 7
C. C 8 H 16 O 8
D. C 3 H 6 O 3
E. C 4 H 8 O 4
B. C 7 H 10 O 7
Which letter represents the hemiacetal bond?
Question 18
3 / 3 pts
A B C D E C
What is the configuration of the following compound? A) α B) β C) D
Question 22
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Question 23
3 / 3 pts
S
Cl N Some carbohydrates form a(n) structure, which resembles a structure in proteins. A) α form B) β-turn C) βeta-sheet D) D-configuration E) α-helix E) α-helix The equilibrium between structures is called mutarotation. A) Anomer and epimer B) α and β
Question 24
3 / 3 pts
Question 25
3 / 3 pts C) L and D D) Helix and beta sheet E) None of the above B) α and β Consider the functions of carbohydrates. Which of the following is not a function of these molecules? Structure Energy storage Enzyme structure Both A and B Both A and C ENZYME STRUCTURE The word saccharide means. Sugar Carbohydrate Energy molecule Sucrose Starch SUGAR
Question 26
5 / 5 pts
5 / 5 pts 5/ 5 pts A) In the above structure, how many monosaccharide units are furanoses and how many are pyranoses? B) What is the linkage between the monosaccharides? C) Is this a reducing sugar? A) 2 pyranoses; 0 furanoses B) β 1 → 4 C) yes, it has free anomeric carbon
Question 28
(Short response) A hiker is lost in the wilderness and without food. He runs across several beetles with hard chitin exoskeletons. Would he get nutrition in the form of glucose from eating these beetles? Explain. The human enzyme cannot break down the bond between the glucose residues in chitin. The bond is a β 1 → 4, but human enzymes only act upon α 1 → 4. So, no he should not eat the beetles as food.
Question 29
(Short response) What is the difference between amylose and amylopectin? Amylose is a single chain of glucose molecules connected by alpha 1 → → 4 linkages. This molecule contains a single main chain. Amylopectin also contains a main chain of glucose residues connected by alpha 1 → → 4 linkages, but it has branches every 24 to 30 glucose residues. The branches are alpha 1 → → 6 linkages, which have branch chains that are also connected by alpha 1 → → 4 linkages.
(Short response) A) Which carbon in the following molecule determines if the molecule is D or L? Indicate the letter corresponding the correct carbon (“A”, “B”, etc.) and explain. B) Is this molecule D or L? Carbon E. It is the penultimate carbon and tells the viewer if the sugar is D or L. This monosaccharide is D.
Question 30
5 / 5 pts
