All Free Biology MCQs with Answers

4391. _ gives blue color with iodine.

• A. Glycogen
• B. Cellulose
• C. Dextrin
• D. Starches

Explanation: The iodine test is used to test the presence of starch. Starch turns its color to dark blue-black upon addition of aqueous solutions of the triodide anion, due to the formation of an intermolecular charge- transfer complex.

4392. It is found abundantly in muscle and liver cells:

• A. Starch
• B. Chitin
• C. Glycogen
• D. Amylose

Explanation: In animals, surplus glucose is converted into insoluble glycogen and then it is stored in muscle and liver cells. This conversion is regulated by insulin.

4393. It is highly insoluble in water:

• A. Glycogen
• B. Amylose
• C. Cellulose
• D. Agar

Explanation: Correct option: C) Cellulose is highly insoluble in water.

4394. Pick up the one which yields glucose molecules upon hydrolysis:

• A. Starch
• B. Glycogen
• C. Cellulose
• D. Starch, Glycogen and Cellulose

Explanation: All of them are polymers of glucose monomers and are synthesized by condensation of glucose monomers, thus yield glucose monomer upon hydrolysis.

4395. The bacteria, yeast and protozoans found in the digestive tract of herbivores secrete:

• A. Amylase
• B. Cellulase
• C. Lipase
• D. Ptyalin

Explanation: Cellulase is any of several enzymes produced chiefly by fungi, bacteria and protozoans that catalyze the cellulolysis, the decomposition of cellulose and of some related polysaccharides.

4396. It gives no color with iodine:

• A. Amylose
• B. Amylopectin
• C. Glycogen
• D. Cellulose

Explanation: Correct option: D) Cellulose gives no color with iodine.

4397. They are insoluble in water and soluble in organic solvents:

• A. Nucleic acids
• B. Carbohydrates
• C. Lipids
• D. Proteins

Explanation: Correct option: C) Lipids are insoluble in water and soluble in organic solvents.

4398. Lipids store double amount of energy, as compared to the equal amount of carbohydrates, because of:

• A. Higher proportion of C-H bonds
• B. Higher proportion of C-N bonds
• C. Higher proportion of C-O bonds
• D. Lower proportion of C-O-P bonds

Explanation: Correct option: A) Lipids store double the amount of energy compared to an equal amount of carbohydrates because of their higher proportion of C-H bonds.

4399. Pick up the one which is not a lipid:

• A. Acylglycerols and waxes
• B. Phospholipids and sphingolipids
• C. Carotenoids and steroids
• D. Dextrins and pectins

Explanation: Correct option: D) Dextrins and pectins are not lipids.

4400. Chemically _ can be defined as esters of fatty acids and alcohol.

• A. Phospholipids
• B. Waxes
• C. Acylglycerols
• D. Terpenoids

Explanation: Correct option: C) Acylglycerols can be defined as esters of fatty acids and alcohol.