Question

select the part whose main job is to help ribosomes make proteins. cytoskeleton vacuole rough endoplasmic reticulum mitochondria

Explanation:

To determine the correct answer, we analyze the functions of each option:

• Cytoskeleton: Provides structural support and helps in cell movement, not related to protein synthesis by ribosomes.
• Vacuole: Stores substances like water, nutrients, or waste, not involved in protein synthesis.
• Rough Endoplasmic Reticulum (RER): Has ribosomes attached to its surface. These ribosomes synthesize proteins, and the RER helps in the processing and transport of these proteins. So, it directly assists ribosomes in making proteins.
• Mitochondria: Known as the powerhouse of the cell, it produces energy (ATP) through cellular respiration, not related to protein synthesis by ribosomes.

Answer:

rough endoplasmic reticulum