Food Molecules Online Quiz

Iodine is a chemical indicator that turns a dark blue, black, or purple color in the presence of starch.

Iodine does not react with glucose, so it remains the color of the iodine solution itself, which is typically brown or yellowish-brown.

Benedict's reagent changes from blue to green, yellow, orange, or brick red depending on the concentration of reducing sugars like glucose.

Benedict's solution is the standard chemical indicator used to detect the presence of reducing sugars such as glucose.

Indicators are substances that change color in the presence of a specific chemical, allowing for the identification of that substance.

In a chemical reaction, the substances present at the start are called reactants, which are consumed to form products.

The substances formed as a result of a chemical reaction are known as products.

Enzymes are biological catalysts that speed up reactions without being consumed, meaning they can be used repeatedly.

Enzymes are catalysts that are not consumed in reactions, so they are indeed re-usable. The statement claiming they are not re-usable is false.

Enzymes function as biological catalysts that increase the rate of chemical reactions in the body.

Proteins are large molecules made up of long chains of smaller units called amino acids.

Plants store energy in the form of starch, which is a polysaccharide synthesized from glucose produced during photosynthesis.

Glucose is a monosaccharide, which is the simplest form of a carbohydrate.

The three primary macronutrients (food molecules) required by the body are carbohydrates, proteins, and fats.

Food provides the chemical energy necessary for organisms to perform biological functions. While food contains vitamins and minerals, those are nutrients rather than the definition of food itself.