CCS Food Chemistry & Biochemistry

Question 1

Which reaction between amino acids and reducing sugars produces the brown color and complex flavors in seared meats and bread crusts?

Accepted Answer

Maillard reaction

Answer

The Maillard reaction occurs when amino acids and reducing sugars react under heat, generating hundreds of flavor compounds and brown pigments (melanoidins).

Question 2

Which type of molecular bond is primarily responsible for maintaining the alpha-helix secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Answer

Hydrogen bonds between the carbonyl oxygen of one peptide bond and the amino hydrogen of another stabilize the alpha-helix conformation.

Question 3

What is the primary functional role of lecithin when added to chocolate or salad dressings?

Accepted Answer

Emulsifier

Answer

Lecithin is a phospholipid whose hydrophilic head and hydrophobic tail allow it to stabilize oil-in-water emulsions by reducing interfacial tension.

Question 4

What pH range characterizes most culinary acids such as vinegar and citric acid?

Accepted Answer

Below 7.0

Answer

Acids have pH values below 7.0; vinegar is approximately pH 2.4 and citric acid solutions typically range from pH 2–6 depending on concentration.

Question 5

Which carbohydrate undergoes retrogradation upon cooling, causing gels and stale bread texture?

Accepted Answer

Starch

Answer

During retrogradation, amylose and amylopectin chains in cooked starch reassociate into ordered crystalline structures as the food cools, stiffening texture.

(CCS) Certified Culinary Scientist Practice Test

(CCS) Certified Culinary Scientist Practice Test

CCS Food Chemistry & Biochemistry