Enzymes with answers pdf

 

Enzymes are globular protein its main function is to speed up of a biochemical reaction therefore also called as biocatalyst.Here are some important mcqs about enzymeswith answers which are mostly repeated in medical entry tests like MDCAT and NEET;

1-Enzymes are _in nature:

Answer: PROTEIN 

2-Enzymes are _type of protein:

Answer: GLOBULAR PROTEIN

3-The reactants on which enzymes work are called as:

Answer: SUBSTRATE

4-Enzymes work by lowering _of the reaction they catalyze:

Answer: ACTIVATION ENERGY

5-The only enzyme which is not protein in nature called as:

Answer: RIBOZYME 

6-Ribozyme enzyme is _in nature:

Answer: RNA

7-The rate of enzymatic reaction doubles by every _increase in temprature:

Answer: 10 Degree centigrade

8-The temperature at which enzymes perform best activity called as:

Answer: OPTIMUM TEMPERATURE

9-The optimum temperature of mammalian enzymes is :

Answer: 10 DEGREE CENTIGRADE

10-In prokaryotic cell enzymes for cellular respiration found in :

Answer: MESOSOMES

11-The place on enzyme where substrate binds and change into sitable product called as:

Answer: ACTIVE SITE

12-Active site contain _aminoacids:

Answer:3-12

13-Induced fit model was proposed by:

Answer: DANIEL KOSHLAND

14-Lock and key model was proposed by:

Answer: EMIL FISHER

15-Induced fit model was proposed in:

Answer: 1959

16-Lock and key model was proposed in:

Answer: 1894

17-Active site has _site:

Answer; 2 (BINDING SITE AND CATALYTIC SITE)

18-Enzymes do catlysis by _ways:

Answer: 3

19-Enzymes has _structures:

Answer: 3 (SECONDARY,TERTIARY AND QUARTERNARY)

20-Most of the cellular secretions are:

Answer: GLYCOPROTEINS

21-The active site of an enzyme is _:

Answer:CHARGE BEARING

22-The mammalian enzymes which required optimum temperature less than mammalian optimum temperature located in _organ:

Answer: TESTES(35 DEGREE CELSIUS)

23-ES Complex converted into product by:

Answer: CATLYTIC SITE

24-The functional group of an enzyme is :

Answer: CO FACTOR

25-Allosteric enzymes has _major sites:

Answer: 2

26-Heme part of heamoglobin act as _cofactor:

Answer: PROSTHETIC GROUP

27-The cofactor which is an inorganic ion and detacheable called as:

Answer: ACTIVATOR

28-The examples of organic cofactors are;

Answer: PROSTHETIC GROUP AND COENZYES

29-The defeciency of which type cofactor lead to diseases:

Answer:CO ENZYMES

30-Which type of cofactor attached permanently with enzymes:

Answer: PROSTHETIC GROUP

31-NAD AND FAD are examoles of _type of cofactor:

Answer: COENZYMES

32-A molecule that act as enzyme but not protein in nature is callled :

Answer: AMYLOPSIN

33-Most enzymes present in _of the cell:

Answer: CYTOPLASM

34-The enzyme which is non functional called as:

Answer: APOENZYME

35-The lower the activatio energy ,_the reaction will be:

Answer: FASTER

36-Cofactors are_part of an enzyme:

Answer: NON PROTEIN

37-Mostly optimum pH of mammlian enzymes are:

Answer: 7-8

38-Optimum pH of pancreatic lipase is:

Answer: 9

39-The optimum pH of protease enzyme(stomach) is:

Answer: 1

40-The optimum pH of pepsin is:

Answer: 2

41-The optimum pH of invertase enzyme is:

Answer: 4.5

42-The optimum pH of catalse enzyme is:

Answer: 7

43-The optimum pH of enzyme trypsin is:

Answer: 8

44-The breakdown of egg albumin etc at alkaline pH in stomach is done by_enzyme:

Answer: TRYPSIN

45-The molecules they bind with enzyme butnot converted into suitable product called as:

Answer: INHIBITORS

46-The type of inhibitor which compete with substrate for active site called as:

Answer: COMPETITIVE INHIBITOR

47-Cyanides are example of _inhibitors:

Answer: NON COMPETITIVE 

48-Which type of inhibitor also called as REVERSIBLE INHIBITORS:

Answer: COMPETITIVE

49-Feedback inhibiton is example of _type of inhibitors:

Answer: COMPETITIVE 

50-If temperature increases from 10 to 40 degree celsius the rate of reaction will be increase by_times:

Answer: 6 TIMES

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