Question

the primary use of ingested proteins in the body is to _____.
be broken down into amino acids that are used to build proteins and nucleic acids within the body
interact with signaling molecules to trigger the building of muscle fibers
be broken down to release energy and the unused components are recycled to build new proteins within the body
be converted to starches or sugars, which are more readily accessible forms of energy

Explanation:

Ingested proteins are first broken - down into amino acids. These amino acids are the building blocks for proteins and nucleic acids in the body. While proteins can be used for energy in certain situations, their primary role is for synthesis. They are not primarily used for muscle - building signaling, energy - release with recycling, or conversion to starches/sugars.

Answer:

be broken down into amino acids that are used to build proteins and nucleic acids within the body