Which of the following structures is responsible for creating proteins?

The ribosomes are the structures responsible for creating proteins, making them essential to the process of protein synthesis. Ribosomes facilitate the translation of messenger RNA (mRNA) into polypeptide chains, effectively assembling amino acids in the correct sequence to form proteins. This process occurs in all living cells and is crucial for various cellular functions, including growth, repair, and maintenance.

The endoplasmic reticulum plays a supporting role in protein synthesis by helping in the folding and modification of proteins after they have been assembled by the ribosomes. However, it is not the primary structure that creates proteins.

Mitochondria are primarily known as the powerhouses of the cell, responsible for energy production through aerobic respiration, whereas lysosomes are involved in the breakdown and recycling of cellular waste and debris. Thus, ribosomes are specifically designed for protein synthesis, distinguishing them clearly in their function compared to the other structures mentioned.