Food science quiz
Kitchen results often follow simple scientific principles. Explore browning, emulsions, yeast, and the changes that happen when food is heated. Each round reshuffles the questions and choices, with an explanation after every answer.
Questions and choices are shuffled every round. The note appears as soon as you answer.
Review
What you'll learn
- Distinguish Maillard browning from caramelization and enzymatic browning
- Understand why oil and vinegar separate when left to stand
- Recognize how egg yolk and mustard can help stabilize emulsions
- Identify common reasons mayonnaise or other sauces split
- Understand how yeast produces gas and why excessive heat can stop it working
- Recognize how acidity can slow browning in cut fruit
Answer preview
Answer The Maillard reaction between amino acids and sugars at high heat
The Maillard reaction occurs when amino acids and reducing sugars react at high temperatures, producing brown color and roasted aromas. It is different from freezing, soap formation, and fermentation.
Answer Caramelization
Caramelization is the browning and flavor development of sugar under heat. Emulsification combines liquids that do not normally stay mixed, while fermentation involves microorganisms.
Answer Yes
Caramelization is driven by changes in sugar during heating. The Maillard reaction, by contrast, involves both amino compounds and sugars. The two reactions can both create brown color but are not the same.
Answer They separate into layers
Oil and the water-based vinegar do not naturally stay mixed, so they separate when left alone. Whisking or an emulsifier can keep the mixture together for longer.
Answer Emulsifying substances in egg yolk that interact with both oil and water
Egg yolk contains emulsifiers such as lecithin, which help oil disperse in the water-based part of the sauce. Ice, yeast, and bark do not perform this role.
Answer The emulsion may split and become runny
If too much oil is added before it can disperse, the emulsion may fail and the sauce can separate. Adding the oil gradually while whisking helps stabilize it.
Answer It can help the oil and vinegar stay mixed for longer
Mustard contains compounds that can help stabilize an emulsion, so a shaken vinaigrette may stay combined a little longer. It does not freeze or convert vinegar into sugar.
Answer The cut fruit usually browns through an enzyme-driven reaction
When fruit tissue is cut, enzymes can react with oxygen and darken the surface. The brown crust on seared meat is mainly associated with high-temperature browning such as the Maillard reaction.
Answer Its acidity can reduce the activity of browning enzymes
The acidity of lemon juice can slow the enzymes responsible for browning. It does not cook the apple or remove all of its moisture.
Answer Keeping it in acidic lemon water
Acidic lemon water can slow enzymatic browning. Exposure to air and damaged cells make browning more likely, so they do not have the same protective effect.