Question 1

Which of the following best explains why unopened canned foods can remain safe for years without refrigeration?

Accepted Answer

Canning creates an environment with virtually no oxygen and low moisture, inhibiting microbial growth.

Question 2

A food manufacturer wants to prevent the growth of bacteria in a fruit juice. Which combination of preservation strategies would be most effective?

Accepted Answer

Decrease moisture level and increase acidity.

Question 3

Which equation best represents the relationship between microbial growth rate ($$G) $$and the limiting factors of temperature ($$T$$), moisture ($$M$$), and oxygen ($$O_2$$)?

Accepted Answer

$$G = f(T, M, O_2$)$$, where reducing any factor decreases $$G$$

Question 4

Which of the following preservation methods is most likely to increase the acidity of a food product to inhibit microbial growth?

Accepted Answer

Fermentation

Question 5

A food additive is being considered for approval by the FDA. Which of the following must be demonstrated before it can be used in foods?

Accepted Answer

It must be shown to be effective and safe.

Question 6

Which of the following statements about the GRAS (Generally Recognized As Safe) list is correct?

Accepted Answer

The GRAS list includes substances with a long history of safe use or scientific evidence of safety.

Question 7

Which type of food additive is most likely to be used to prevent browning in cut apples?

Accepted Answer

Bleaching agents

Question 8

A manufacturer adds salt to cured meats. What is the primary preservation mechanism?

Accepted Answer

Salt acts as an antimicrobial agent, reducing water activity.

Question 9

Which of the following best describes why honey can be stored at room temperature for long periods without spoiling?

Accepted Answer

Honey contains virtually no water, inhibiting microbial growth.

Question 10

Which of the following is a correct pairing of a preservation method and its mechanism?

Accepted Answer

Fermentation: increases acidity, inhibiting microbial growth.

Question 11

A new food additive is being considered for use in bread to improve texture. Which category does this additive most likely belong to?

Accepted Answer

Thickening agents

Question 12

Which of the following is NOT a requirement for a new food additive to be approved by the FDA?

Accepted Answer

It must be shown to be affordable.

Question 13

Which preservation method is most commonly associated with the production of probiotics?

Accepted Answer

Fermentation

Question 14

A food scientist wants to design a new preservation method that targets all three main requirements for microbial growth. Which combination should they focus on?

Accepted Answer

Temperature, moisture level, and oxygen

Question 15

Which of the following best describes the role of antioxidants as food additives?

Accepted Answer

They prevent oxidation, preserving nutrients and flavor.

Question 16

Which of the following statements about food additives is TRUE?

Accepted Answer

All additives must be tested for safety by the FDA before they can be added to food.

Question 17

A food product is preserved by lowering its pH to below 4.6. Which preservation method is most likely being used?

Accepted Answer

Fermentation

Question 18

Which of the following is a function of bleaching agents as food additives?

Accepted Answer

Preserving color in foods

Question 19

Which preservation method is most effective for foods with high moisture content and why?

Accepted Answer

Drying, because it reduces water activity and inhibits microbial growth.

Question 20

A food additive is classified as 'Generally Recognized As Safe' (GRAS). What does this mean?

Accepted Answer

It has a long history of safe use or is supported by scientific evidence.

Food Preservation and Additives: Mechanisms, Regulation, and Types

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