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FN43 - 3.03 Enzymes & Phytochemicals

Total questions: 20

Worksheet time: 20mins

Name
Class
Date
1.

What is the effect of a strong acid on enzymes?

a)

It activates enzyme inhibitors

b)

Enzyme reactions are unaltered

c)

The enzyme-substrate complex cannot form

d)

It triggers neutralization of acids and bases

2.

Phytochemicals are a group of compounds produced by plants. Which compound is an example of phytochemicals?

a)

Fatty acids

b)

Flavonoid pigments

c)

Gums and gels

d)

Hydrates

3.

Which process will slow or stop enzymatic browning in fruits and vegetables?

a)

blanching

b)

dehydration

c)

hydrolysis

d)

neutralization

4.

How does enzyme activity improve the flavor of food?

a)

Browns the food

b)

Causes ripening

c)

Increases nutrient value

d)

Prevents spoilage

5.

Which does NOT denature enzymes?

a)

sugar

b)

pH

c)

heat

d)

salts

6.

Enzyme reactions occur more rapidly as a result of:

a)

lower substrate levels

b)

lower temperatures

c)

shape changes of the enzyme

d)

water availability

7.

Which is an example of a natural enzyme source that will weaken a protein gel?

a)

grapes

b)

honeydew

c)

pineapple

d)

raspberries

8.

Carotenes are a group of compounds that are phytochemicals. Which foods are good sources of carotenes?

a)

collard greens

b)

kidney beans

c)

onions

d)

strawberries

9.

Which action will result in denaturing the enzymes present?

a)

adding sugar

b)

chilling in the refrigerator

c)

neutralizing ions

d)

warming to the simmer point

10.

An impact of enzymes is to:

a)

emulsify mixtures

b)

increase usable nutrients

c)

initiate reactions

d)

thicken protein mixtures

11.

Which is an example of enzymes being used to improve a food's appearance?

a)

amylase in baked goods

b)

invertase in candy

c)

lactase in milk

d)

pectic enzymes in fruit juice

12.

Which food preparation tip has the MOST potential health benefits as a result of increasing levels of phytochemicals in the diet?

a)

add citrus peel to baked goods

b)

marinate lean meats

c)

replace sugar with artificial sweeteners

d)

substitute applesauce for oil in muffins and breads

13.

Which is an example of enzymes making food more digestible for people with an intolerance?

a)

amylase in baked goods

b)

invertase in candy

c)

lactase in milk

d)

pectic enzymes in fruit juice

14.

Which food color change is a result of enzymatic browning?

a)

green to black tea

b)

which to brown sugar

c)

whole milk to caramel

d)

whole wheat bread to toast

15.

A(n) _______  is a substance that starts a reaction between substances without being affected by the reaction.

a)

enzyme

b)

catalyst

c)

inhibitor

d)

substrate

16.

Any substance that will prevent an enzyme-substrate complex from forming is a(n):

a)

enzyme

b)

catalyst

c)

inhibitor

d)

substrate

17.

A substance on which an enzyme acts:

a)

enzyme

b)

catalyst

c)

inhibitor

d)

substrate

18.

The location where an enzyme attaches to a substrate

a)

coenzyme

b)

nomenclature

c)

oxidizer

d)

active site

19.

The system for naming enzymes:

a)

enzyme labeling

b)

nomenclature

c)

oxidization standard

d)

activation assignment

20.

To soak a food in flavorful liquid:

a)

nomenclature

b)

marinade

c)

enzymatic browning

d)

enzyme soak