Quiz
Carbohydrate Structure and Function
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Perguntas do quiz (15)
1When glucose is in a straight-chain formation, it:
- Ais an aldoketose.
- Bis a pentose.
- Chas five chiral carbons.
- Dis one of a group of 16 stereoisomers.
2All of the following are true of epimers EXCEPT:
- Athey differ in configuration about only one carbon.
- Bthey usually have slightly different chemical and physical properties.
- Cthey are diastereomers (with the exception of glyceraldehyde).
- Dthey have equal but opposite optical activities.
3Aldonic acids are compounds that:
- Acan be oxidized, and therefore act as reducing agents.
- Bcan be reduced, and therefore act as reducing agents.
- Chave been oxidized, and have acted as reducing agents.
- Dhave been oxidized, and have acted as oxidizing agents.
4The formation of ⍺-D-glucophranose from β-D-glucopyranose is called:
- Aglycosidation.
- Bmutarotation.
- Cenantiomerization.
- Dracemization.
5Ketose sugars may have the ability to act as reducing sugars. Which process explains this?
- AKetose sugars undergo tautomerization.
- BThe ketone group is oxidized directly.
- CKetose sugars undergo anomerization.
- DThe ketone group is reduced directly.
6What is the product of the following reaction?
- A1
- B2
- C3
- D4
- A1
7Which of the following enzymes cleaves polysaccharide chains and yields maltose exclusively?
- Aα-Amylase
- Bβ-Amylase
- CDebranching enzyme
- DGlycogen phosphorylase
8When the following straight-chain Fischer projection is converted to a chair or ring conformation, its structure will be:
- A1
- B2
- C3
- D4
9Why is the α-anomer of D-glucose less likely to form than the β-anomer?
- AThe β-anomer is preferred for metabolism.
- BThe β-anomer undergoes less electron repulsion.
- CThe α-anomer is the more stable anomer.
- DThe α-anomer forms more in L-glucose.
10Which two polysaccharides share all of their glucosidic linkage types in common?
- ACellulose and amylopectin
- BAmylose and glycogen
- CAmylose and cellulose
- DGlycogen and amylopectin
11Which of the following is digestible by humans and is made up of only one type of monosaccharide?
- ALactose
- BSucrose
- CMaltose
- DCellobiose
12The reaction below is an example of one step in:
- Aaldehyde formation.
- Bhemiketal formation.
- Cmutarotation.
- Dglycosidic bond cleavage.
13Galactose is the C-4 epimer of glucose, the structure of which is shown below. Which of the following structures is galactose?
- A1
- B2
- C3
- D4
14Andersen's disease (glycogen storage disease type IV) is a condition characterized by a deficiency in glycogen branching enzyme. Absence of this enzyme would be likely to cause all of the following effects EXCEPT:
- Adecreased glycogen solubility in human cells.
- Bslower action of glycogen phosphorylase.
- Cless storage of glucose in the body.
- Dglycogen devoid of α-1,4 linkages.
15The cyclic forms of monosaccharides are:
I. hemiacetals.
II. hemiketals.
III. acetals.- AI only
- BIII only
- C! and II only
- D!, II, and III
Informações
- Descrição
- MCAT Biochemistry Quiz sobre Carbohydrate Structure and Function, criado por Sean Corcoran em 10-07-2016.
- Autor
- Sean Corcoran
- Idioma
- English
- Visualizações
- 1
- Etiquetas
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