Class XII Important Questions BIOMOLECULES

1. Name the water insoluble component of starch.

2. Which linkage holds monosaccharide units in polysaccharide?
3. What is the name given to the change of specific rotation of sugar?
4. Name a reagent used to check reducing nature of carbohydrates.
5. How many -OH groups are present in molecule of glucose?
6. What is the general term used for a monosaccharide containing six carbon atoms?
7. Name the product formed when glucose reacts with HCN.
8. Which optical nature is signified by + sign in D-(+)-glucose molecule?
9. Which of the following is not a reducing sugar?
Glucose, Maltose, Sucrose, Lactose
10. Which carbohydrate cannot be digested by human digestive system?
11. Which sugar is commonly known as milk sugar?
12. Name the component of starch that is insoluble in water.
13. In aqueous solution, amino acids exist as a dipolar ion. What is the name given to this dipolar ion
14. Which biomolecules can acts as biological catalyst?
15. Name the protein present in hairs.
16. Which structure of proteins remain unaffected during denaturation?
17. Which linkage joins two amino acids?
18. Name a globular protein that is secreted by pancreas.
19. Which amino acid does not show optical activity?
20. Which secondary structure of proteins is more stable?
21. Deficiency of which vitamin causes convulsions?
22. Which vitamin we get from exposure to sunlight?
23. Deficiency of which vitamin causes night- blindness?
24. Name a rich source of vitamin-C.
25. Name the product formed when glucose reacts with bromine water.
26. Which base is present in RNA but not in DNA?

27. Which nucleic acid is responsible for protein synthesis?
28. Which linkage is found in nucleotides?
29. Give an example of an essential amino acid.
30. What is the ultimate product of digestion of proteins?

ANSWER:

1. Amylopectin   2. Glyosidic         3. Inversion         4. Tollen's reagent
5. Five                 6. Hexose                       7. Cyanohydrin   8. Dextrorotatory
9. Sucrose           10. Cellulose                  11. Lactose         12. Amylopectin
13. Zwitter ion    14. Proteins / Enzymes  15. Keratin          16. Primary         

17. Peptide linkage                                    20. a-helix           18. Insulin           

19. Glycine                   21. Vitamin B6    24. Amla               22. Vitamin-D      

23. Vitamin A      25. Gluconic acid         26. Uracil              27. RNA              

28.Phosphodiester linkage                       29. Valine         30. Amino acids