#1. Why does the rate of an enzyme controlled reaction plateau at a certain substrate concentration? ? plateau means level out

rate of reaction plateaus because above a certain substrate concentration, pH rises causing denaturation

it does not plateau

all of the active sites are occupied and so additional substrates cannot find an active site

#2. What are the monomers of fats/lipids?

DNA

fatty acids

chloroplasts

amino acids

proteins

nucleotides

mitochondria

carbohydrates

#3. What is the Lock and Key Model of enzyme action?

the active site and substrate do not fit exactly together but the shape changes as they come together

the active site changes to fit with new substrates over its lifetime

the active site and the substrate fit exactly together

the active site is not related to enzyme action

#4. Why does the rate of an enzyme controlled reaction increase with greater substrate concentration?

The rate of reaction does not increase

The rate of reaction increases because higher substrate concentration leads to warmer temperatures

The rate of reaction increases because there are available active sites, so more reactions take place

#5. What is the role of glycogen synthase?

synthesises glycogen from glucose

breaks down proteins in the diet

breaks down fats in the diet

synthesises starch from glucose

breaks down hydrogen peroxide made during cell reactions

synthesises DNA from its monomers

breaks down starch to small sugars such as maltose

#6. What is the role of catalase?

breaks down fats in the diet

breaks down starch to small sugars such as maltose

synthesises glycogen from glucose

synthesises starch from glucose

synthesises DNA from its monomers

breaks down hydrogen peroxide made during cell reactions

breaks down proteins in the diet

#7. What is an active site?

a molecule that is changed during a reaction

A specific region on an enzyme where the substrate binds and the reaction takes place

the diameter of the area you can see through a microscope

#8. What is the role of starch synthase?

synthesises glycogen from glucose

breaks down starch to small sugars such as maltose

breaks down fats in the diet

synthesises DNA from its monomers

breaks down proteins in the diet

breaks down hydrogen peroxide made during cell reactions

synthesises starch from glucose

#9. What is enzyme specificity?

the active site changes to fit with new substrates over its lifetime

describes the ability of an enzyme to catalyse only a particular reaction or set of reactions

the efficiency of an enzyme in catalysing reactions

#10. What is enzyme activity?

the efficiency of an enzyme in catalysing reactions

the active site changes to fit with new substrates over its lifetime

describes the ability of an enzyme to catalyse only a particular reaction or set of reactions

#11. Why is catalysis by enzymes important for life processes?

It speeds up and facilitates chemical reactions

It slows down and prevents negative chemical reactions

#12. What is the role of DNA synthase?

breaks down fats in the diet

breaks down proteins in the diet

breaks down starch to small sugars such as maltose

synthesises DNA from its monomers

breaks down hydrogen peroxide made during cell reactions

synthesises starch from glucose

synthesises glycogen from glucose

#13. What are substrates?

the process by which plant cells get longer/bigger

proteins which act as biological catalysts

the movement of particles across a membrane against the concentration gradient

a molecule that is changed during a reaction

building blocks of the basic macromolecules of life

#14. What is the role of amylase?

synthesises glycogen from glucose

breaks down starch to small sugars such as maltose

breaks down proteins in the diet

breaks down hydrogen peroxide made during cell reactions

synthesises DNA from its monomers

synthesises starch from glucose

breaks down fats in the diet

#15. Why is the rate of an enzyme controlled reaction highest at an optimum pH?

at high and low pH the substrates and enzymes repel each other

above and below the optimum the shape of the active site is changed

it is not different and there is no optimum

#16. What is the Induced Fit Model of enzyme action?

the active site and the substrate fit exactly together

the active site and substrate do not fit exactly together but the shape changes as they come together

the active site changes to fit with new substrates over its lifetime

the active site is not related to enzyme action

#17. Why is the rate of an enzyme controlled reaction lower at lower temperatures?

at low temperatures enzymes and substrates are moving slowly and are less likely to meet

at low temperatures enyzmes close up their active sites and do not accept substrates

#18. Why does the rate of an enzyme controlled reaction go down as temperature increases past the optimum level?

high temperatures cause the substrate to dissolve

high temperatures cause denaturation - changing the shape of the active site

high temperatures cause the substrate to move too quickly to find an enzyme

#19. What are enzymes?

the movement of particles across a membrane against the concentration gradient

building blocks of the basic macromolecules of life

the process by which plant cells get longer/bigger

a molecule that is changed during a reaction

proteins which act as biological catalysts

#20. What is the role of protease?

synthesises starch from glucose

synthesises glycogen from glucose

synthesises DNA from its monomers

breaks down proteins in the diet

breaks down starch to small sugars such as maltose

breaks down hydrogen peroxide made during cell reactions

breaks down fats in the diet

Topic Overview - Enzymes and Nutrition

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Results

#1. Why does the rate of an enzyme controlled reaction plateau at a certain substrate concentration? ? plateau means level out

#2. What are the monomers of fats/lipids?

#3. What is the Lock and Key Model of enzyme action?

#4. Why does the rate of an enzyme controlled reaction increase with greater substrate concentration?

#5. What is the role of glycogen synthase?

#6. What is the role of catalase?

#7. What is an active site?

#8. What is the role of starch synthase?

#9. What is enzyme specificity?

#10. What is enzyme activity?

#11. Why is catalysis by enzymes important for life processes?

#12. What is the role of DNA synthase?

#13. What are substrates?

#14. What is the role of amylase?

#15. Why is the rate of an enzyme controlled reaction highest at an optimum pH?

#16. What is the Induced Fit Model of enzyme action?

#17. Why is the rate of an enzyme controlled reaction lower at lower temperatures?

#18. Why does the rate of an enzyme controlled reaction go down as temperature increases past the optimum level?

#19. What are enzymes?

#20. What is the role of protease?

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