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In this experiment, the scientist was investigating which chemical would stop the activity of ribosomes in pathogenic bacteria. Ribosomes are responsible for protein synthesis in cells. When the ribosomes are not functioning properly, protein synthesis is disrupted.
Option 1: DNA synthesis. This option is unrelated to ribosomes. DNA synthesis involves the replication of DNA molecules, which is not the target of the experiment.
Option 2: Protein synthesis. This is the correct answer. Ribosomes are directly involved in protein synthesis, and inhibiting their activity would disrupt this process.
Option 3: Digestion of proteins. This option is unrelated to ribosomes. Digestion of proteins involves the breakdown of proteins into smaller peptides and amino acids, which occurs in the digestive system, not within cells.
Option 4: Production of adenosine triphosphate (ATP). This option is unrelated to ribosomes. ATP is the energy currency of cells and is produced through cellular respiration, not by ribosomes.
Therefore, the correct answer is Option 2: Protein synthesis.