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- 1. Multiple ChoiceEnzymes are considered to beLipidsCarbohydrateProteinNucleic Acid
- 2. Multiple ChoiceWhat is the purpose of an enzyme?give permission for the reactionraise activation energyspeed up reactionscontrol how many reactions occur
- 3. Multiple ChoiceWhere do substrates bind on an enzyme?voltage-gated channelssurface receptorcalcium channelsactive site
- 4. Multiple ChoiceHow do enzymes increase the speed of chemical reactions?reducing the number of productsreducing the activation energyincreasing the temperature of the cellincreasing the concentration of reactants
- 5. Multiple ChoiceWhat is a substance called if it speeds up a chemical reaction?reusablecatalystspecificfragile
- 6. Multiple ChoiceWhat is the name for the mechanism of enzyme activity?Lock and keyjigsaw puzzlehammer and nailtwo hands pattern
- 7. Multiple ChoiceAny substance that is acted upon by an enzyme is called a(n)?CoenzymeSubstrateVitaminPolypeptide
- 8. Multiple ChoiceAfter the enzyme and substrate bind together and perform the reaction, what does the substrate become?a substratean enzymea productan active site
- 9. Multiple Choicecan a change in pH alter the active site of an enzymeyesno
- 10. Multiple ChoiceWhich of these is NOT true?Enzymes can denature (change shape) when the temperature gets too high.Enzymes can only be used once in a chemical reaction.Extreme pH can denature enzymes.Enzymes speed up chemical reactions.
- 11. Multiple ChoiceWhat happens when enzymes are heated to a high temperature?The enzymes die.The shapes of the enzyme are altered or denaturedThe enzymes' amino acid sequence changes.The enzymes remain the same
- 12. Multiple ChoiceWhat are the enzymes called when they are at low temperature?denaturedKilledinactivenormal
- 13. Multiple Choice
Letter D...active siteenzymesubstrateproducts - 14. Multiple ChoiceLetter B...active siteenzymesubstrateproducts
- 15. Multiple ChoiceLetter C...active siteenzymessubstrateproducts
- 16. Multiple ChoiceLetter E...active siteenzymesubstrateproducts
- 17. Multiple ChoiceWhat is the activation energy?The energy of the productsThe energy of the reactantsThe minimum energy needed by the reactants to form the products.The energy lost in the reaction
- 18. Multiple Choice
What suffix is commonly applied to enzymes?
-ase
-ose
-ter
-ice
- 19. Multiple Choice
Enzymes act as catalysts to __________ the rate of a biochemical reaction by ___________ the activation energy needed for the reaction to occur.
increase, lowering
decrease, lowering
increase, raising
decrease, raising
- 20. Multiple Choice
The induced fit model is preferred over the lock-and-key model because
some enzymes catalyze multiple reactions.
all substrates have the same shape.
the active site is a polar region.
the enzyme and substrate match each other structurally and chemically.
- 21. Multiple Choice
According to the induced fit model, as a substrate approaches an enzyme, it induces a ______________ in the active site.
conformational change
chemical change
color change
- 22. Multiple Choice
After an enzyme is denatured, the substrate can ______ to the active site.
bind
no longer bind
- 23. Multiple Choice
The loss of enzyme shape is called
denaturation.
stress.
random movement.
alignment.
- 24. Multiple Choice
What compound is found in the cells of many fruits and vegetables. When this chemical comes into contact with catecholase and oxygen, it reacts to form benzoquinone and water?
lactose
glucose
catechol
galactose
- 25. Multiple Choice
catechol + 2 O2 + ______________ → Benzoquinone + water
catecholase
water
hydrogen peroxide
sulfuric acid
- 26. Multiple Choice
catechol + 2O2 + catecholase → ___________________ + water
Benzoquinone
Catechol
hydrogen peroxide
sulfuric acid
- 27. Multiple Choice
catechol + 2O2 + catecholase → Benzoquinone + ___________
Benzoquinone
Catechol
water
sulfuric acid
- 28. Multiple Choice
When the product benzoquinone gets exposed to air, it converts to a pigment that is responsible for the dark coloration of bruised fruits and vegetables. What is the name of that pigment?
melanin
carotene
chlorophyll
anthocyanin
- 29. Multiple Choice
Of the steps listed, which would you do first?
Allow the Spec to warm up per manufacturer's instructions
Wipe the blank cuvette to remove fingerprints
With the cuvette removed, set the absorbance to 0
Insert the blank cuvette and calibrate the spec.
- 30. Multiple Choice
A spectrophotometer can be used to (check all that apply):
determine the presence of a substance in a solution.
measure the concentration of an unknown solution.
determine the molecular composition of an unknown substance.
identify an unknown substance
- 31. Multiple Choice
The amount of light absorbed by a sample is called its:
Absorbance
Transmittance
Hue
Saturation
- 32. Multiple Choice
A small container that is used to hold samples intended for spectroscopic analysis:
Cuvette
Test Tube
Microcentrifuge Tube
PCR Tube
- 33. Multiple Choice
The amount of light that passes through a sample is called:
Transmittance
Absorbance
Radiation
Quantum force
- 34. Multiple Choice
Which answer has the steps for using the spectrophotometer in the correct order?
Set wavelength → place sample in machine → close lid → zero out the machine → place blank in machine → close lid → take reading
Set wavelength → place blank in machine → close lid → zero out the machine → place sample in machine → close lid → take reading
- Answer choicesTagsAnswer choicesTags