CN Nutritional Science & Biochemistry

Question 1

Which macronutrient provides the highest energy yield per gram?

Accepted Answer

Fats

Answer

Fats provide the highest energy yield per gram among macronutrients, offering approximately 9 calories per gram. This makes them a very efficient source of concentrated energy for the body. In contrast, carbohydrates and proteins each provide about 4 calories per gram.

Question 2

Which vitamin is essential for collagen synthesis and wound healing?

Accepted Answer

Vitamin C

Answer

Vitamin C is essential for collagen synthesis, acting as a crucial cofactor for the enzymes involved in collagen production. Collagen is a primary structural protein in connective tissues, skin, and blood vessels, making Vitamin C vital for wound healing and maintaining tissue integrity. A deficiency can impair the body's ability to repair itself.

Question 3

Which mineral is a key component of hemoglobin and essential for oxygen transport?

Accepted Answer

Iron

Answer

Iron is a key component of hemoglobin, the protein in red blood cells responsible for transporting oxygen from the lungs to the rest of the body. Without sufficient iron, the body cannot produce enough healthy red blood cells, leading to impaired oxygen delivery. This makes iron essential for overall energy and cellular function.

Question 4

What is the primary function of dietary fiber in the digestive system?

Accepted Answer

Promotes bowel regularity and gut health

Answer

The primary function of dietary fiber in the digestive system is to promote bowel regularity and support gut health. Fiber adds bulk to stool, facilitating its passage through the intestines and preventing constipation. It also acts as a prebiotic, feeding beneficial gut bacteria and contributing to a healthy microbiome.

Question 5

Which metabolic process converts glucose into energy in cells?

Accepted Answer

Glycolysis

Answer

Glycolysis is the initial metabolic pathway that breaks down glucose into pyruvate, releasing a small amount of ATP (energy) in the process. This fundamental anaerobic process occurs in the cytoplasm of cells and is the first step in both aerobic and anaerobic respiration to generate cellular energy.

(CN) Certified Nutritionist Practice Test

(CN) Certified Nutritionist Practice Test

CN Nutritional Science & Biochemistry