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WorksheetsFN43 - 3.03 Enzymes & Phytochemicals
Total questions: 20
Worksheet time: 20mins
What is the effect of a strong acid on enzymes?
It activates enzyme inhibitors
Enzyme reactions are unaltered
The enzyme-substrate complex cannot form
It triggers neutralization of acids and bases
Phytochemicals are a group of compounds produced by plants. Which compound is an example of phytochemicals?
Fatty acids
Flavonoid pigments
Gums and gels
Hydrates
Which process will slow or stop enzymatic browning in fruits and vegetables?
blanching
dehydration
hydrolysis
neutralization
How does enzyme activity improve the flavor of food?
Browns the food
Causes ripening
Increases nutrient value
Prevents spoilage
Which does NOT denature enzymes?
sugar
pH
heat
salts
Enzyme reactions occur more rapidly as a result of:
lower substrate levels
lower temperatures
shape changes of the enzyme
water availability
Which is an example of a natural enzyme source that will weaken a protein gel?
grapes
honeydew
pineapple
raspberries
Carotenes are a group of compounds that are phytochemicals. Which foods are good sources of carotenes?
collard greens
kidney beans
onions
strawberries
Which action will result in denaturing the enzymes present?
adding sugar
chilling in the refrigerator
neutralizing ions
warming to the simmer point
An impact of enzymes is to:
emulsify mixtures
increase usable nutrients
initiate reactions
thicken protein mixtures
Which is an example of enzymes being used to improve a food's appearance?
amylase in baked goods
invertase in candy
lactase in milk
pectic enzymes in fruit juice
Which food preparation tip has the MOST potential health benefits as a result of increasing levels of phytochemicals in the diet?
add citrus peel to baked goods
marinate lean meats
replace sugar with artificial sweeteners
substitute applesauce for oil in muffins and breads
Which is an example of enzymes making food more digestible for people with an intolerance?
amylase in baked goods
invertase in candy
lactase in milk
pectic enzymes in fruit juice
Which food color change is a result of enzymatic browning?
green to black tea
which to brown sugar
whole milk to caramel
whole wheat bread to toast
A(n) _______ is a substance that starts a reaction between substances without being affected by the reaction.
enzyme
catalyst
inhibitor
substrate
Any substance that will prevent an enzyme-substrate complex from forming is a(n):
enzyme
catalyst
inhibitor
substrate
A substance on which an enzyme acts:
enzyme
catalyst
inhibitor
substrate
The location where an enzyme attaches to a substrate
coenzyme
nomenclature
oxidizer
active site
The system for naming enzymes:
enzyme labeling
nomenclature
oxidization standard
activation assignment
To soak a food in flavorful liquid:
nomenclature
marinade
enzymatic browning
enzyme soak
