Difficulty: Medium

Average Score: 67%

Which of the following is a major function of protein?

Rationale

Builds and repairs body tissue.

Proteins serve as the primary building blocks of body tissues, playing a crucial role in growth, repair, and maintenance of cells and tissues. This function is vital for overall health and recovery from injuries, making protein essential in the diet.

A (Builds and repairs body tissue) CORRECT

This option correctly identifies a fundamental function of proteins. They are made up of amino acids that contribute to the structural components of muscles, skin, organs, and other tissues, facilitating growth and repair processes throughout the body.

B (Lubricates the joints and mucous membranes) YOUR ANSWER

While lubrication of joints and mucous membranes is essential for bodily functions, it primarily involves substances like synovial fluid and mucins, not proteins. Therefore, this choice does not accurately reflect a major function of proteins.

C (Prevents disease caused by nutritional deficiencies) YOUR ANSWER

This statement is more aligned with the role of vitamins and minerals, which are critical in preventing nutritional deficiencies and associated diseases. While proteins are important for overall health, they do not specifically prevent diseases caused by a lack of other nutrients.

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

Fatty acids are primarily provided by lipids, not proteins. While proteins can play various roles in metabolism, they do not serve as a direct source of fatty acids for insulation, making this option incorrect.

Conclusion

Proteins are essential macromolecules that primarily function to build and repair body tissues. While other nutrients contribute to bodily functions such as lubrication and disease prevention, proteins stand out for their structural role in maintaining and rejuvenating the body. Understanding these functions is crucial for nutritional science and health.

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