Monday, November 5, 2012

carbohydrate-ehab10f


*1*.*The most abundant bio molecule on the earth *
a) Nucleic acids
b) proteins
c) lipids
d) carbohydrates

*2. The major functions of carbohydrates
a) structural framework
b) storage
c) both a and b
d) none of these

*3. The general formula of carbohydrate is*
a) (CH2O)n
b) (C4H2O)n
c) (C6H2O)n
d) (C2H2O)n COOH

*4. Carbohydrates are *
a) polyhydroxy aldehydes and phenols
b) polyhydroxy aldehydes and ketones
c) polyhydroxy ketones and phenols
d) polyhydroxy phenols and alcohols

*5. Structural polysaccharides include*
a) cellulose, hemicellulose and chitin
b) cellulose, starch and chitin
c) cellulose, starch and glycogen
d) cellulose, glycogen and chitin

*6. Nutritional polysaccharides are*
a) starch and glycogen
b) starch and chitin
c) starch and cellulose
d) starch and glucose

*7. Glycogen in animals are stored in  *
a) liver and spleen
b) liver and muscles
c) liver and bile
d) liver and adipose tissue

*8. Carbohydrates accounts*
a) 30% in plants and 20% in animals
b) 30% in plants and 10% in animals
c) 30% in plants and 1% in animals
d) 50% in plants and 50% in animals

*9. Smallest carbohydrates are trioses. Which of the following is a triose?*
a) glucose
b) ribulose
c) ribose
d) glyceraldehyde

*10. Which of the following is a reducing sugar
a) glucose
b) dihydroxyacetone
c) erythulose
d) none of these

*11. Oligosaccharides linked to proteins are called *
a) glycoproteins
b) glycolipids
c) galactosides
d) ganglioside

*12. In polysaccharides, monosaccharaides are joined by*
a) peptide bond
b) glucose bond
c) glycosidic bond
d) covalent bond

*13. Sucrose is a *
a) monosaccharide
b) disaccharide
c) polysaccharide
d) triose**

*14. Lactose is a disaccharide consists of*
a) glucose and fructose
b) glucose and galactose
c) glucose and sucrose
d) glucose and ribose

*15. In lactose, the linkage is*
a) β-1-4 linkage
b) β-1-2 linkage
c) α-1-4 linkage
d) α-1-2 linkage

*15. Maltose is a disaccharide consists of*

a) glucose and fructose
b) glucose and galactose
c) glucose and sucrose
d) glucose and glucose

*16. In maltose, the linkage is*
a) β-1-4 linkage
b) β-1-2 linkage
c) α-1-4 linkage
d) α-1-2 linkage

*17. Starch consists of *
a) unbranched amylose and branched amylopectin
b) branched amylose and branched amylopectin
c) unbranched amylose and unbranched amylopectin
d) none of these

*18. Cellulose is made up of repeating units of*
a) β-1-4 linkage between D-glucose units
b) β-1-2 linkage between D-glucose units
c) α-1-4 linkage between D-glucose units
d) α-1-2 linkage between D-glucose units

*19. Amylopectin has*
a) β-1-4 and β-1-6 linkage
b) β-1-2 linkage
c) α-1-4 and α-1-6 linkage
d) α-1-2 linkage

*20. Chitin consists of*
a) N-acetyl muramic acid
b) N-acetyl glucosamine
c) D-glucose units
d) N-acetyl muramic acid and N-acetyl glucosamine

*Answers*
*1-d*
*2-c*
*3-a*
*4-b*
*5-a*
*6-a*
           
*7-a*
*8-c*
*9-d*
*10-a*
*11-a*
*12-c*
*13-b*
*14-b*
*15-d*
*16-c*


------------------------------------------ Best Wishes: Dr.Ehab Aboueladab, Tel:01007834123 Email:ehab10f@gmail.com,ehababoueladab@yahoo.com ------------------------------------------
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