Igcse2010 fernando enzymes

Enzymes Mainly based on the exercises from http://www.biology-resources.com/biology-questions.html IGCSE Revision Questions http://biodeluna.wordpress.com

Recommended resources to study enzymes. ,[object Object],[object Object]

What is an enzyme? ,[object Object]

What is an enzyme? ,[object Object],A substance that speeds up reactions without changing the produced substances

Guess the word... Reactions that build up molecules Reactions that break down molecules Combination of anabolic and catabolic reactions The molecule(s) the enzyme works on Molecule(s) produced by enzymes

[object Object],Reactions that build up molecules Reactions that break down molecules Combination of anabolic and catabolic reactions The molecule(s) the enzyme works on Molecule(s) produced by enzymes

[object Object],[object Object],Reactions that build up molecules Reactions that break down molecules Combination of anabolic and catabolic reactions The molecule(s) the enzyme works on Molecule(s) produced by enzymes

[object Object],[object Object],[object Object],Reactions that build up molecules Reactions that break down molecules Combination of anabolic and catabolic reactions The molecule(s) the enzyme works on Molecule(s) produced by enzymes

[object Object],[object Object],[object Object],[object Object],Reactions that build up molecules Reactions that break down molecules Combination of anabolic and catabolic reactions The molecule(s) the enzyme works on Molecule(s) produced by enzymes

[object Object],[object Object],[object Object],[object Object],[object Object],Reactions that build up molecules Reactions that break down molecules Combination of anabolic and catabolic reactions The molecule(s) the enzyme works on Molecule(s) produced by enzymes

[object Object],http://www.epc.org/mediafiles/lock--key.jpg

Write the formula for glucose.

Write the formula for glucose. ,[object Object]

Name the chemical elements present in a protein

Name the chemical elements present in a protein ,[object Object],[object Object]

A protein-digesting enzyme when mixed with starch solution would ... ,[object Object],[object Object],[object Object],[object Object]

A protein-digesting enzyme when mixed with starch solution would ... ,[object Object],[object Object],[object Object],[object Object],no effect on starch .

What does the enzyme catalase do?

What does the enzyme catalase do? ,[object Object]

Which of the following are the building blocks of catalase? ,[object Object],[object Object],[object Object],[object Object]

Factors which affect enzyme activity

Factors which affect enzyme activity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],http://www.crampuppy.com/1/IGCSE/biology/digestion.shtml

[object Object],rate of reaction

[object Object],[object Object],[object Object],[object Object],[object Object]

In any enzyme experiment you should control variables as: ,[object Object],[object Object]

In an experiment to investigate the influence of temperature on the rate of reaction of a mylase on a starch solution, the following results were obtained: Plot these results on a graph, with temperature on the horizontal axis. (a) Between 20º C and 35º C, what is the effect of temperature on the rate of reaction? (b) What appears to be the optimum temperature for the reaction between salivary amylase andstarch? (c) Why do you think the reaction starts to slow down above 44º C? (d) Why do you think the reaction stops completely above 50° C? 25 17 11 7 4.5 4 3 6.5 12.5 no change even after 30 min 20 25 28 31 33 37 44 47 50 55 Reaction time before iodine gave negative results/min Temperature ° C

In an experiment to investigate the influence of temperature on the rate of reaction of a mylase on a starch solution, the following results were obtained: Plot these results on a graph, with temperature on the horizontal axis. (a) Between 20º C and 35º C, what is the effect of temperature on the rate of reaction? (b) What appears to be the optimum temperature for the reaction between salivary amylase andstarch? (c) Why do you think the reaction starts to slow down above 44º C? (d) Why do you think the reaction stops completely above 50° C? REMEMBER : Test for starch: Iodine turns from brown to black 25 17 11 7 4.5 4 3 6.5 12.5 no change even after 30 min 20 25 28 31 33 37 44 47 50 55 Reaction time before iodine gave negative results/min Temperature ° C

What enzymes do you know taking part in digestion? ,[object Object]

What enzymes do you know taking part in digestion? ,[object Object],[object Object],[object Object],http://www.crampuppy.com/1/IGCSE/biology/digestion.shtml And what do they do?

Enzymes in digestion ,[object Object],[object Object],[object Object],Amylase breaks down starch into maltose Protease (pepsin, trypsin) breaks down protein into polypeptides Lipase breaks down fat into glycerol and free fatty acids http://www.crampuppy.com/1/IGCSE/biology/digestion.shtml

[object Object],enzyme active site substrate product denature temperature pH optimum catalase amylase trypsin pepsin pectinase lactase protease catalyst catalyse protein FROM: http://www.clickbiology.com/igcse-biology-revision-video-enzymes/

Concepts of biology- Using the Core Learning Goals: Science ,[object Object]

Igcse2010 fernando enzymes

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