Nursing Elites

1. What is a primary function of macronutrients in the body?

• A. Regulate metabolic processes.
• B. Supply energy.
• C. Maintain homeostasis.
• D. Control cellular activity.

Correct answer: B

Rationale: The correct answer is B: Supply energy. The primary function of macronutrients such as carbohydrates, fats, and proteins is to supply energy for various bodily functions. Choices A, C, and D are incorrect because while regulating metabolic processes, maintaining homeostasis, and controlling cellular activity are essential functions in the body, they are not the primary roles of macronutrients. Macronutrients mainly serve as a source of energy to support daily activities and bodily functions.

2. Protein is constantly being exchanged between which two components?

• A. tissue and plasma.
• B. the liver and the small intestine.
• C. blood and lymph.
• D. the heart and lungs.

Correct answer: A

Rationale: The correct answer is 'tissue and plasma.' Protein turnover involves the continuous exchange of proteins between body tissues and the bloodstream (plasma) as part of normal metabolic processes. This process ensures a balance in protein levels throughout the body. Choices B, C, and D are incorrect as they do not represent the primary sites for protein turnover in the body.

3. Which component of protein contains nitrogen?

• A. Amino group
• B. Carboxyl group
• C. Peptide bond
• D. Side chain

Correct answer: A

Rationale: The correct answer is the amino group. Amino groups are functional groups found in amino acids, which are the building blocks of proteins. These groups contain nitrogen and are essential for the structure and function of proteins. The carboxyl group (choice B) contains carbon, oxygen, and hydrogen, while the peptide bond (choice C) is a covalent bond formed between amino acids in a protein chain. The side chain (choice D) refers to the unique chemical structure attached to the central carbon of an amino acid and varies among different amino acids, but it does not specifically contain nitrogen.

4. What are the major sources of energy for the body?

• A. Proteins and fats.
• B. Carbohydrates and fats.
• C. Proteins and carbohydrates.
• D. Vitamins and minerals.

Correct answer: B

Rationale: The correct answer is B: Carbohydrates and fats. Carbohydrates are the body's primary and most efficient source of energy, providing fuel for daily activities. Fats are also a significant energy source, especially during times of prolonged or intense exercise. Proteins are primarily used for building and repairing tissues, not as a major energy source. Vitamins and minerals are essential for various bodily functions but do not serve as direct sources of energy.

5. How is the enzyme trypsin activated?

• A. By zymogen.
• B. By bile.
• C. By gastrin.
• D. By enterokinase.

Correct answer: D

Rationale: The correct answer is D: By enterokinase. Trypsin is activated by enterokinase, an enzyme secreted by the small intestine. Enterokinase plays a crucial role in converting trypsinogen into its active form, trypsin. Choices A, B, and C are incorrect because trypsin is specifically activated by enterokinase, not by zymogen, bile, or gastrin.

Similar Questions