Question

proteins are another main group of organic compounds found in cells.
which of the following are the primary functions of proteins? select the three best choices.
to control chemical reactions
to transmit hereditary information from an organism to its offspring
to provide structure and support for cells, tissues, and organs
to supply energy for a cells immediate use
to control cell processes, such as growth and repair

Explanation:

1. Control chemical reactions: Enzymes, a type of protein, act as biological catalysts to speed up (control the rate of) cellular chemical reactions.
2. Provide structure and support: Structural proteins like collagen (for tissues/organs) and cytoskeletal proteins (for cells) give shape and support to cells, tissues, and organs.
3. Control cell processes (growth/repair): Regulatory proteins (like transcription factors, growth factors) manage cellular processes including growth and repair.

• Transmitting hereditary information is the role of nucleic acids (DNA/RNA), not proteins.
• Immediate cell energy is primarily supplied by carbohydrates (like ATP), not proteins (proteins are a secondary energy source only in extreme cases).

Answer:

• to control chemical reactions
• to provide structure and support for cells, tissues, and organs
• to control cell processes, such as growth and repair