01
Choose one
1 point
Which description best defines a triacylglycerol, the main type of lipid in most food fats and oils?
Free Practice Quiz Question List
5 Lipids in Foods Online Quiz Questions
Use this free practice quiz with 20 questions to review 5 Lipids in Foods, test your knowledge, and prepare for your next test or exam.
20 questions
02
Choose one
1 point
Why can lecithin help stabilize an emulsion containing both water and oil?
- A
It converts water into oil during mixing.
- B
It makes every oil-in-water emulsion permanently stable.
- C
It helps stabilize the boundary between water and oil.
- D
It prevents droplets from forming in the first place.
03
Choose one
1 point
A baker beats solid fat with sugar before mixing in other ingredients. What structural effect can this step help produce?
- A
It can hold small air pockets when beaten with sugar.
- B
It turns all the sugar into a liquid emulsion.
- C
It prevents any air from entering the mixture.
- D
It converts flour proteins into fat crystals.
04
Choose one
1 point
Lipid hydroperoxides form during oxidation and then break down. Which outcome is consistent with this breakdown?
- A
Glycerol and three new fatty acids
- B
Phospholipids and sterols
- C
Only water and carbon dioxide
- D
Smaller compounds such as aldehydes, ketones, and alcohols
05
Choose all
1 point
Select all the conditions or lipid features that can make food-lipid oxidation more likely or proceed more readily.
- A
Exposure to light
- B
Limiting exposure to oxygen
- C
Exposure to heat
- D
A greater number of double bonds in the fatty acid
06
Choose all
1 point
Select all the statements that correctly describe how fat crystallization and processing can affect food texture.
- A
Cooling rate can influence fat crystal size and arrangement.
- B
Mixing can influence the arrangement of fat crystals.
- C
All fats have one sharp melting point, so processing cannot change their texture.
- D
A network of solid crystals can trap liquid oil and help shape spreadability.
07
True or false
1 point
True or false: A food fat generally has one sharp melting point because all of its triacylglycerols melt at the same temperature.
- A
True
- B
False
08
True or false
1 point
True or false: Hydrolysis can break triacylglycerols into glycerol and fatty acids, and it is a different reaction from lipid oxidation.
- A
True
- B
False
09
Written response
1 point
A fatty acid has exactly one double bond in its carbon chain. What is its classification?
10
Written response
1 point
Butter consists of water dispersed in a continuous oil or fat phase. What type of emulsion is it?
11
Fill in the blank
1 point
In naturally occurring unsaturated fatty acids, cis double bonds cause the chain to , making close molecular more difficult.
12
Fill in the blank
1 point
In baked goods, fat can coat flour particles and limit some development, contributing to a texture.
13
Open ended
1 point
Explain two ways lipids influence the flavor and aroma perceived when food is eaten. Include how they can contribute to both desirable and undesirable flavor outcomes.
14
Choose one
1 point
A food fat contains relatively long, highly saturated fatty acids. Compared with a fat rich in shorter, more unsaturated fatty acids, what behavior is generally expected?
- A
They usually pack less readily and have higher melting points.
- B
They generally pack more readily and have higher melting points.
- C
Their melting behavior is unrelated to chain length or saturation.
- D
They always have lower melting points than shorter, less saturated fatty acids.
15
Written response
1 point
What category describes a fatty acid whose carbon chain has no double bonds?
16
True or false
1 point
True or false: Hydrolysis and oxidation are the same chemical process because both can change food flavor and quality.
- A
True
- B
False
17
Choose one
1 point
Two fats differ mainly in fatty-acid composition. Which change would generally make the fat pack more readily and have a higher melting point?
- A
A shorter, more unsaturated fatty-acid composition generally raises the melting point.
- B
A longer, more saturated fatty-acid composition generally raises the melting point.
- C
The number of double bonds has no general relationship to packing or melting behavior.
18
Choose one
1 point
A food scientist classifies the continuous and dispersed liquid phases in mayonnaise and butter. Which classification is correct?
- A
Mayonnaise is oil-in-water; butter is water-in-oil.
- B
Mayonnaise is water-in-oil; butter is oil-in-water.
- C
Both are water-in-oil emulsions.
- D
Both are oil-in-water emulsions.
19
Written response
1 point
What is the general name for a food-fat molecule in which glycerol is joined to three fatty acids?
20
Choose one
1 point
A spread contains both solid fat crystals and liquid oil. What is the most likely textural effect of a network formed by the crystals?
- A
It converts all the liquid oil into solid fat, producing a single sharp melting point.
- B
It prevents fat crystals from forming, so the food remains uniformly liquid.
- C
It forms a crystal network that traps some liquid oil and helps set the food's texture.
- D
It separates the fat from the food so that the fat cannot affect texture.