Biomolecules One Mark Questions

1. A dipeptide does not have

a) two peptide units                                  b) portions of two amino acids

c) an amino / amido group                        d) salt like structure.

2. Glucose forms ------------------ with acetic anhydride and sodium acetate

a) di-acetate          b) tetra-acetate            c) penta-acetate           d) hexa-acctate.

3. Glucose is not oxidised to gluconic acid by

a) Br2/H2O           b) Fehling solutions     c) Tollen’s reagent       d) Conc. HNO3

4. Glucose reacts with acetic anhydride in the presence of pyridine to give

a) monoacetate      b) diacetate                 c) penta acetate           d) no reaction

5. Important constituent of cell wall is

a) Lipid                 b) Cellulose                 c) Protein                     d) Vitamin

6. Inversion of sucrose refers to

a) oxidation of sucrose                              b) reduction of sucrose

c) sucrose to glucose and fructose            d) polymerisation of sucrose.

7. Invert sugar is a mixture of equal amount of

a) D (+) glucose and sucrose                     b) D (-) fructose and sucrose

c) D (+) glucose and D (-) fructose           d) sucrose and maltose.

8. -------------is involved in the process of blood coagulation.

a) Fats and oils      b) Cephalin                  c) Glycolipids              d) Lecithins.

9. Mixture of equal molecules of D (+) glucose and D (-) fructose is called as

a) Fruit sugar         b) Invert sugar             c) Cane sugar              d) Non-sugar.

10. Nucleic acid is made up of

a) an organic base b) a sugar unit               c) phosphoric acid       d) all of these.

11. Proteins are

a) polypeptides      b) polyacids                 c) polyphenols             d) polyesters.

12. Sorbitol and Mannitol are

a) isomers              b) polymers                 c) epimers                    d) dimmers

13. Sucrose contains glucose and fructose linked by

a) C₁ – C₁              b) C₁ – C₂                 c) C₁ – C₄                    d) C₁ – C₆

14. The amino acid without chiral carbon is

a) Alanine              b) Glycine                   c) Proline                     d) Thyrosine

15. The building block of proteins are

a) α-hydroxy acidsb) α-amino acids          c) β-hydroxy acids      d) β-amino acids

16. The most abundant carbohydrate is

a) glucose              b) fructose                   c) starch                       d) cellulose

17. The optically inactive amino acid is

a) Glysine              b) Alanine                   c) proline                     d) phenyl alanine

18. The precipitation of protein is called

a) peptisation         b) denaturation            c) renaturation             d) none of these

19. The reducing sugar (of / among the following) is

a) sucrose              b) cellulose                  c) glucose                    d) starch.

20. Ultimate product of hydrolysis of protein is

a) aniline                b) aliphatic acid           c) amino acid               d) aromatic acid.

21. When starch is heated to 200°C - 250°C, the product is

a) dextrin               b) caramel                    c) barley sugar             d) cellulose.

22. Which is not true of amino acid?

a) It forms Zwitter ion                              b) Has Isoelectric point

c) Dual behavior                                      d) insoluble in NaOH solution.
23. An example for reducing disaccharide is
a) Glucose              b) Fructose                c) Sucrose                        d) Lactose
FIVE MARKS