OBJECTIVES OF FOOD CHEMISTRY AND NUTRITION (1 TO 40 )
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| FOOD CHEMISTRY AND NUTRITION |
1. Environmental factors such as temperature and pH exert their effect on the ______ of microbial cells.
a. Membranes
b. DNA
c. Enzymes
d. Cell wall
2. An enzyme _________ the activation energy required for a chemical reaction.
a. Increases
b. Provides
c. Lowers
d. Catalyzes
3. Algin is
a. A polysachharide
b. A lipid
c. A protein
d. A provitamin
4. An enzyme
a. Becomes a part of the final products
b. Is non specific for
substrate
c. Is consumed by the reaction
d. Is heat and pH labile
5. An apoenzyme is where the ________ is located .
a. Cofactor
b. Coenzyme
c. Redox reaction
d. Active site
6. Many coenzyme are
a. Metals
b. Vitamins
c. Proteins
d. Substrates
7. To digest cellulose in its environment, a fungus produces a/an
a. Endoenzytne
b. Exoenzyme
c. Catalase
d. Polymerase
8. In negative feedback control of enzymes, a buildup in the amount of decreases the activity of the enzyme
a. Substrate
b. Reactant
c. Product
d. ATP
9. Consider the following statementsi. Carbohydrates are the compounds made up of Carbon, Hydrogen and Oxygenii. Carbohydrates are the polyhydroxy derivatives of aldehydes and ketones iii.Carbohydrates are polyhydroxy acetals and ketals
Which of the above statements is/ are correct?
a. 2 only
b. 2 and 3
c. 1 and 2
d. 1,2 and 3
10. Due to the presence of one or more asymmetric carbon atom, stereoisomerism is found in carbohydrates except
a. Dihydroacetone
b. Glyceraldehyde
c. Talose
d. Mannose
11. Two sugars differing only in configuration around one specific carbon atom are called
a. Anomers
b. Epimers
c. Isomers
d. Conformers
12. Which of the following pairs of carbohydrates are anomers of each other?
a. a Glucose and P fructose
b. a Glucose and P glucose
c. a Glucose and a mannose
d. All of the above
13. Which of the following pairs of carbohydrates epimers of each other
a. D glucose and D mannose
b. D glucose and D galactose
c. D Ribose and D arabinose
d. All of the above
14 When a and p isomers of glucose are dissolved in water, the optical rotation of each gradually changes with time and approaches final equilibrium value of
a. [a]20 D = + 52.7°
b. [a]20 D = + 98.3°
c. [a]20 D= -52.7°
d. [QC]20 D = - 98.3*
15. This change in the optical activity of the racemic mixture is called
a. Reversion
b. Mutarotation
c. Inversion
d. Isomerization
16. Formation of pyranoses or furanoses are a special case of a more general type of reaction between aldehydes and alcohols to form a
a. Acid
b. Hemiacetals
c. Hemiketals
d. Ethers
17. Isomeric forms of monosaccharides that differ in from each other only in configurationabout carbonyl alcohol are
a. Anomers
b. Epimers
c. Isomers
d. Conformers
18. Which of the following statement is correct?
a. The equatorial hydroxyl group of pyranoses are easily esterified than axial
b. The boat form of the pyranose ring, which is relatively rigid and more stable than the chair form, predominates in aqueous solution of hexoses
c. Monosaccharides are sensitive to hot dilute mineral acids
d. All of the above
19. Concentrated acids causes
a. Dehydration of sugars
b. Formation of furfurals
c. Formation aldehyde derivatives of furan
d. All of the above
20. Furfurals condense with phenols like orcinol
a. To rehydrate to form respective sugars
b. To give characteristic coloured product
c. To form a volatile aromatic compound
d. None of the above
21. Aldopyranoses readily react with alcohols in the presence of mineral acids to form
a. Furfurals
b. Glucose and alcohols
c. Uronic acid
d. anomeric a and p. glycosides
22. Which of the following statements is/are correct?
a. Treatment of methyl a - D gluco- pyranoside with perchloric acids cleaves the pyranose ring to yield a dialdehyde and formic acid
b. Glycosides are asymmetric mixed acetals formed by the reaction of anomeric C atom of the intermolecular hemiacetals with a hydroxyl group furnished by an alcohol. This is called glycosidic bond
c. Aldoses and ketoses react with ammonia in an appropriate solvent to form N glycosides or N glycosylamine
d. None of the above
23. Monosaccharides in slightly acidic solution at 100 °C react withexcess phenylhydrazine to form
a. Sugar alcohols
b. Glycosides
c. Glycosylamim
d. Osazone
24. Which of the following pairs of sugars gives same osazone ?
a. Glucose and mannose
b. Glucose and fructose
c. Fructose and mannose
d. All of the above
25. What is phytic acid?
a. Hexaphosphoric acid of inositol
b. Potassium salt of hexaphosphoric acid
c. Phosphorus associated with mannitol
d. Phosphoric acid of sorbitol
26. What is phytih?
a. Phosphorus associated with mannitol
b. Phosphoric acid of sorbitol
c. Calcium salt of phytic acid
d. A polymer of phytic acid
27. With the oxidation of aldehydic carbon of glucose, compound formed is
a. Fructonic acid
b. Gluconic acid
c. Glucouronic acid
d. Frutburonic acid
28. With the oxidation of aldehydes and 1° hydroxyl group carbon of galctose compoundformed is
a. Galactouronic acid
b. Galactonic acid
c. Galactaric acid
d. None of the above
29. With the oxidation of 1° carbon of mannose, the acid formed is
a. Mannouronic acid
b. Mannaric acid
c. Mannoic acid
d. All of the above
30. Which vitamin is the example of sugar acids?
a. Vitamin A
b. Vitamin C
c. Vitamin D
d. Vitamin E
31. Sugar capable of reducing ------— ---- — are called reducing agents
a. Cu 2+
b. Ag +
c. Ferricyanide
d. All of the above
3.2. In which of the following lipo-proteins, the major portion is cholesterol?
a. VLDL
b. LDL
c. HDL
d. All of the above
33. N acyl derivative of nuraminic acid are generally called
a. Phytic acid
b. Muramic acid
c. Sialic acid
d. Uronic acid
34. In disaccharides two monosaccharides are joined together by
a. Glucosidic bond
b. Glyscosidic bond
c. Disulphide bond
d. Hydrogen bond
35. In a sucrose molecule
a. Two glucose molecules are present
b. Two fructose molecules are present
c. One glucose and two fructose molecules are present
d. None of the above
36. Strecker degradation can be seen during
a. Protein biosynthesis
b. Maillard reaction
c. Nucleotide metabolism
d. None of the above
37. Sucrose molecule is a disaccharide in which two monosaccharide are joined together by
a. ot-1,4 glycosidic bond
b. P- 1,4 glycosidic bond
c. a - 1,2 glycosidic bond
d. P- 1,2 glycosidic bond
38. Which of the following statement is / are not correct?
a. Sucrose does not undergo Mutarotation
b. Sucrose is reducing sugar .
c. Sucrose does not react with phenylhydrazine to form osazone
d. All of the above .
39. Palatinose is isomer of sucrose and differ from it in having
a. p- 1,2 glycosidic bond
b. a-1,4 glycosidic bond
c. a- 1,6 glycosidic bond
d. p- 1,6 glycosidic bond
40. Honey contains which of the following sugar
a. Levulose
b. Fructose
c. Both a and b
d. None of the above
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