NCCPT Nutrition and Energy Systems 3

Question 1

Which of the following is an example of a complete protein?

Accepted Answer

Eggs

Answer

Eggs are a complete protein because they contain all nine essential amino acids in adequate proportions.

Question 2

What happens to excess dietary protein that is not used for tissue synthesis?

Accepted Answer

The nitrogen is removed and the carbon skeleton is used for energy or stored as fat

Answer

Excess amino acids undergo deamination; the nitrogen is excreted as urea and the remaining carbon skeleton enters metabolic pathways for energy or fat synthesis.

Question 3

During the Cori cycle, lactate produced by working muscles is transported to the liver and converted back to:

Accepted Answer

Glucose via gluconeogenesis

Answer

In the Cori cycle, lactate is transported from skeletal muscle to the liver, where it is converted back to glucose through gluconeogenesis.

Question 4

Which macronutrient has the highest thermic effect of food (TEF)?

Accepted Answer

Protein

Answer

Protein has the highest thermic effect (~20–30%), meaning the body expends more energy digesting, absorbing, and processing protein than carbohydrates (~5–10%) or fat (~0–3%).

Question 5

What is the primary function of phosphocreatine (PCr) in the ATP-PC energy system?

Accepted Answer

To directly donate a phosphate group to ADP to rapidly regenerate ATP

Answer

Phosphocreatine donates its phosphate group to ADP via creatine kinase, rapidly regenerating ATP during very high-intensity, short-duration activities.

(NCCPT) National Council for Certified Personal Trainers Practice Test

(NCCPT) National Council for Certified Personal Trainers Practice Test

NCCPT Nutrition and Energy Systems 3