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

carbohydrates

proteins

nucleotides

DNA

chloroplasts

mitochondria

amino acids

fatty acids

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

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

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

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

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

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

it is not different and there is no optimum

#4. What are the monomers of proteins?

nucleotides

amino acids

chloroplasts

mitochondria

carbohydrates

DNA

fatty acids

#5. What is the role of starch synthase?

breaks down fats in the diet

synthesises starch from glucose

synthesises DNA from its monomers

synthesises glycogen from glucose

breaks down proteins in the diet

breaks down starch to small sugars such as maltose

breaks down hydrogen peroxide made during cell reactions

#6. What are enzymes?

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

proteins which act as biological catalysts

building blocks of the basic macromolecules of life

#7. 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

#8. What is the role of glycogen synthase?

breaks down starch to small sugars such as maltose

synthesises starch from glucose

breaks down fats in the diet

synthesises DNA from its monomers

synthesises glycogen from glucose

breaks down proteins in the diet

breaks down hydrogen peroxide made during cell reactions

#9. 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

#10. 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

a molecule that is changed during a reaction

the process by which plant cells get longer/bigger

#11. What is the role of amylase?

synthesises starch from glucose

breaks down fats in the diet

synthesises glycogen from glucose

breaks down starch to small sugars such as maltose

breaks down hydrogen peroxide made during cell reactions

synthesises DNA from its monomers

breaks down proteins in the diet

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

It speeds up and facilitates chemical reactions

It slows down and prevents negative chemical reactions

#13. What is an active site?

the diameter of the area you can see through a microscope

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

a molecule that is changed during a reaction

#14. What is the role of protease?

synthesises starch from glucose

breaks down fats in the diet

synthesises DNA from its monomers

synthesises glycogen from glucose

breaks down proteins in the diet

breaks down hydrogen peroxide made during cell reactions

breaks down starch to small sugars such as maltose

#15. 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

#16. What is the role of lipase?

synthesises glycogen from glucose

synthesises starch from glucose

synthesises DNA from its monomers

breaks down proteins in the diet

breaks down hydrogen peroxide made during cell reactions

breaks down starch to small sugars such as maltose

breaks down fats in the diet

#17. What is the role of DNA synthase?

breaks down proteins in the diet

breaks down hydrogen peroxide made during cell reactions

synthesises starch from glucose

breaks down fats in the diet

synthesises glycogen from glucose

breaks down starch to small sugars such as maltose

synthesises DNA from its monomers

#18. 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

#19. 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 is not related to enzyme action

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

the active site and the substrate fit exactly together

#20. What are the monomers of carbohydrates?

glucose

amino acids

nucleotides

chloroplasts

DNA

mitochondria

fatty acids

Topic Overview - Enzymes and Nutrition

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Results

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

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

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

#4. What are the monomers of proteins?

#5. What is the role of starch synthase?

#6. What are enzymes?

#7. What is enzyme specificity?

#8. What is the role of glycogen synthase?

#9. What is enzyme activity?

#10. What are substrates?

#11. What is the role of amylase?

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

#13. What is an active site?

#14. What is the role of protease?

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

#16. What is the role of lipase?

#17. What is the role of DNA synthase?

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

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

#20. What are the monomers of carbohydrates?

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