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

the active site is not related to 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

#2. 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

#3. What are substrates?

the movement of particles across a membrane against the concentration gradient

building blocks of the basic macromolecules of life

proteins which act as biological catalysts

the process by which plant cells get longer/bigger

a molecule that is changed during a reaction

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

the active site is not related to 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

#5. What is the role of starch synthase?

synthesises glycogen from glucose

breaks down fats in the diet

breaks down proteins in the diet

synthesises starch from glucose

breaks down starch to small sugars such as maltose

breaks down hydrogen peroxide made during cell reactions

synthesises DNA from its monomers

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

It speeds up and facilitates chemical reactions

It slows down and prevents negative chemical reactions

#7. What is an active site?

the diameter of the area you can see through a microscope

a molecule that is changed during a reaction

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

#8. What is enzyme activity?

the efficiency of an enzyme in catalysing reactions

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

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

#9. What are the monomers of proteins?

nucleotides

carbohydrates

fatty acids

mitochondria

amino acids

chloroplasts

DNA

#10. 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 the substrate to move too quickly to find an enzyme

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

#11. What is the role of lipase?

synthesises starch from glucose

breaks down fats in the diet

breaks down proteins in the diet

breaks down hydrogen peroxide made during cell reactions

breaks down starch to small sugars such as maltose

synthesises glycogen from glucose

synthesises DNA from its monomers

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

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

The rate of reaction does not increase

#13. What are enzymes?

proteins which act as biological catalysts

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

the movement of particles across a membrane against the concentration gradient

#14. What is the role of amylase?

synthesises DNA from its monomers

synthesises glycogen from glucose

breaks down fats in the diet

breaks down starch to small sugars such as maltose

breaks down proteins in the diet

breaks down hydrogen peroxide made during cell reactions

synthesises starch from glucose

#15. What are the monomers of carbohydrates?

DNA

amino acids

glucose

fatty acids

nucleotides

chloroplasts

mitochondria

#16. What is the role of protease?

breaks down starch to small sugars such as maltose

synthesises starch from glucose

synthesises DNA from its monomers

breaks down proteins in the diet

synthesises glycogen from glucose

breaks down hydrogen peroxide made during cell reactions

breaks down fats in the diet

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

it is not different and there is no optimum

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

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

it does not plateau

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

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

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

carbohydrates

proteins

nucleotides

chloroplasts

mitochondria

DNA

amino acids

fatty acids

#20. What is enzyme specificity?

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

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

the efficiency of an enzyme in catalysing reactions

Topic Overview - Enzymes and Nutrition

Good Luck!

Results

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

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

#3. What are substrates?

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

#5. What is the role of starch synthase?

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

#7. What is an active site?

#8. What is enzyme activity?

#9. What are the monomers of proteins?

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

#11. What is the role of lipase?

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

#13. What are enzymes?

#14. What is the role of amylase?

#15. What are the monomers of carbohydrates?

#16. What is the role of protease?

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

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

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

#20. What is enzyme specificity?

Save Results

Quick Links

Services

Resources