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Biochemistry MCQs and Answers with explanation

Biochemistry MCQs and Answers with explanation

1. Biochemistry covers the practical applications of





... Answer is d)
Explanation: Biochemistry is the branch of chemistry that deals with physical and chemical changes occuring in the living oranism. All of these are involved in living organism. .

2. Macromolecules are of how many types?





... Answer is b)
Explanation: Macromolecules are of four types. These are carbohydrates, proteins, lipids and nucleic acid.

3. The general formula for carbohydrates is





... Answer is d)
Explanation: Consider an example of glucose. Its chemical formula is C6H12O6. So, it can be written as C6(H2O)6 OR Cn(H2O)n

4. Most organic matter on earth is made up of





... Answer is a)
Explanation: Carbohydrates are the most abundant among macromolecules. Therefore, most of organic matter on earth are made up of carbohydrates.

5. The number of carbon atoms in hexose is





... Answer is c)
Explanation: The number of carbon atoms in hexose is 6. Glucose and fructose are hexose because they contain 6 carbon atoms in their molecules.

6. The long chain of amino acids are called:


... Answer is b)
Explanation: When amino group of amino acids one molecule and carboxyl group combine, a peptide bond is formed with elimination of water molecule. Polypetide chain is the long chain of these peptide bonds.

7. Proteins are used in both forms of





... Answer is d)
Explanation: Proteins are used in both processes of anablism and catabolism. These two processes are known as metabolism.

8. What is true about enzymes?





... Answer is b)
Explanation: Enzymes are substance that increase the chemical reaction taking place in the living organism. The increase the reaction rate by lowering their energy of activation..

9. Two what catagory of molecules do enzymes belong?





... Answer is d)
Explanation: Enzymes are proteins molecules that act as a catalyst in chemical reactions occuring in living cells.

10. What is true about co-factors?





... Answer is b)
Explanation: Co-factor is a non-protein part of enzymes or a metal ion that helps an enzyme for its activity as catalyst. That is why they are also known as helper molecules.

11. Prosthatic groups are





... Answer is d)
Explanation: Prosthatic groups are tightly bound crganic or inorgainc components of proteins. They may be carbohydrates, lipids, metal ions or phosphatic group.

12. Lipids are generally defined in terms of





... Answer is a)
Explanation: Lipids are generally defined in terms of solubility. These are naturally occuring substances which are soluble in organic solvents such as chloroform, ethanol, benzene etc and insolube in water.

13. DNA and RNA are made up of





... Answer is b)
Explanation: Nucleotides are basic building blocks of polymeric chains of DNA and RNA. A nucleotide conssist of a ribose sugar(in case of RAN) or deoxyribose sugar(in case of DNA) attached with phosphate group and nitrogeneous base.

14. ------of the human body weight is mineral matter





... Answer is a)
Explanation: Minerals contribute only 5% to human body weight. Minerals are those elements which are required for our body in very small amount to develop and function normally.

15. ------is needed for vitamin C utilization





... Answer is d)
Explanation: Calcium is necessary for utilization of vitamin c. Vitamin c inceases the absorption of calcium which is necessary to prevent the bone loss.

16. The component of blood that carries oxygen in the body is





... Answer is c)
Explanation: Hemoglobin (Hb) is important proteins present in red blood cells that transports oxygen from lungs to various parts of body.

17. Most RNA molecules are





... Answer is c)
Explanation: RNA are single stranded while DNA are double standed nucleotides.

18. -----are the major component of soap





... Answer is a)
Explanation: Soaps are sodium or potasium salts of fatty acids. So fatty acids are the major components of soaps.

19. The minerals, related with the formation of bones and teeth is





... Answer is b)
Explanation: Phosphorous is the second most abundent minerals after calcium that is bound with calcium and support bones and teeth.
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