CCS Food Chemistry & Biochemistry 3

Question 1

Which gluten protein fraction primarily contributes to dough elasticity through intermolecular disulfide bonding?

Accepted Answer

Glutenin

Answer

Glutenin forms large polymeric networks via disulfide bonds, imparting elasticity (snap-back) that allows dough to retain CO₂ gas during fermentation.

Question 2

What does water activity (aw) measure and why is it critical for food preservation?

Accepted Answer

The ratio of water vapor pressure in food to pure water, indicating microbial availability

Answer

Water activity (aw, 0–1.0) quantifies how much water is available for microbial growth and chemical reactions; most pathogens cannot proliferate below aw 0.85.

Question 3

Which volatile phenolic aldehyde is the principal flavor compound responsible for vanilla's characteristic aroma?

Accepted Answer

Vanillin

Answer

Vanillin (4-hydroxy-3-methoxybenzaldehyde) is the dominant aroma-active compound in vanilla beans and can be extracted naturally or synthesized from lignin.

Question 4

At what approximate temperature range does the Maillard reaction proceed most rapidly in food systems?

Accepted Answer

140–165°C (284–329°F)

Answer

The Maillard reaction accelerates significantly above 140°C, which is why browning occurs during baking, roasting, and frying but not in boiling water (100°C).

Question 5

Which functional protein property describes the formation of a three-dimensional network that immobilizes water and creates semi-solid texture?

Accepted Answer

Gelation

Answer

Gelation occurs when denatured proteins aggregate into a structured network that entraps water, as in egg custards, tofu, and meat gels.

(CCS) Certified Culinary Scientist Practice Test

(CCS) Certified Culinary Scientist Practice Test

CCS Food Chemistry & Biochemistry 3