Enzymes Objective Questions and Answers

1. Interrelated chemical reactions involved in metabolic activities of every living cell for the maintenance of life are catalysed by specific proteinanceous substances called ?
(A) Co-factors
(B) Regulators
(C) Enzymes
(D) Phytohormones

2. In plant enzymes are being synthesized by the living cells under the direction of
(A) DNA of chloroplasts
(B) DNA of mitochondria
(C) DNA of nucleus
(D) All of the above

3. Who defined the enzyme as “simple or combined proteins acting as specific catalysts”
(A) Jolly and Dixon
(B) Sumner and Myrback
(C) Boveri
(D) Sutton

4. Who coined the word enzyme ?
(A) Kuhne
(B) Traube
(C) Buchner
(D) Sumner

5. who discovered that yeast extract could bring about fermentation of grape juice and coined the word zymase for the active principle involved in it?
(A) Edward Buchner
(B) James B. Sumner
(C) Louis Pasteur
(D) Freidrich W. Kuhne

6. Which among the following is the “first cell free enzyme preparation”
(A) Trypsin
(B) Pepsin
(C) Trypsinogen
(D) Zymase

7. Except for a small group of catalytic RNA molecules such as RNA enzymes or ribo-zymes, all enzymes are ?
(A) Proteins
(B) Hormones
(C) Carbohydrates
(D) Fats

8. The chemical substance on which the enzymes act, is called-
(A) As its substrate
(B) As its group
(C) As its compartmentalization
(D) As its conjugated protein

9. The specific region of the enzymic protein which is involved in biochemical reaction, is known as ?
(A) Substrate
(B) Fermentation
(C) Conjugated protein
(D) Active centre

10. The conjugated enzymic proteins have a non-protein part for which these enzymes are known as ?
(A) Apoenzymes
(B) Prosthetic groups
(C) Holoenzymes
(D) Chymotrypsinogen

11. Protein part of the enzyme is often called ?
(A) Holoenzyme
(B) Apoenzyme
(C) Prosthetic group
(D) Conjugated protein

12. Complete enzyme including the prosthetic group is called ?
(A) Apoenzyme
(B) Holoenzyme
(C) Prosthetic group
(D) All of the above

13. The enzymes of TCA-cycle for complete oxidation of Pyruvic acid into CO2 and H2O are present in-
(A) Chloroplasts
(B) Mitochondria
(C) Peroxisomes
(D) Mesosomes

14. Enzymes which are synthesized by the living cells, usually operate them within the boundary of their plasma membrane are called
(A) Holoenzymes
(B) Apoenzymes
(C) Endoenzymes
(D) Extracellular enzymes

15. Multiple forms of enzymes with the same catalytic activity but different structure are
(A) Holoenzymes
(B) Isoenzymes
(C) Prosthetic groups
(D) Apoenzymes