Difficulty: Easy

Average Score: 86%

Which of the following Is a major function of protein?

Rationale

Builds and repairs body tissue.

Proteins play a crucial role in the growth, maintenance, and repair of tissues throughout the body. They are essential components of muscles, skin, organs, and other body structures, facilitating recovery and development.

A (Builds and repairs body tissue) CORRECT

This option accurately reflects one of the primary functions of proteins. They are composed of amino acids, which are the building blocks necessary for creating and repairing tissue, making this choice correct.

B (Lubricates the joints and mucous membranes) YOUR ANSWER

While lubrication of joints and mucous membranes is essential for bodily function, this role is primarily fulfilled by lipids and synovial fluids, not proteins. Proteins do contribute to the structure of these tissues, but they are not the major lubricating agents.

C (Prevents disease caused by nutritional deficiencies) YOUR ANSWER

Preventing disease caused by nutritional deficiencies is more closely related to vitamins and minerals rather than proteins. While proteins are vital for overall health, they do not directly prevent nutritional deficiency diseases; that role is more specifically associated with micronutrients.

D (Supplies fatty acids to insulate the body) YOUR ANSWER

Fatty acids serve primarily as energy sources and insulation, functions fulfilled by lipids, not proteins. Although proteins can assist in various metabolic processes, they do not provide the fatty acids needed for insulation, making this choice incorrect.

Conclusion

Proteins are essential macromolecules that primarily function to build and repair body tissues, making option A the correct answer. While other choices reference important biological processes, they do not pertain to the fundamental roles of proteins, which are crucial for tissue maintenance and overall bodily function. Understanding these functions highlights the importance of proteins in a balanced diet for health and recovery.

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