Which of the following structures is NOT considered a membrane-bound organelle?

What is the primary function of ribosomes in a cell?

Which of the following best describes the function of the smooth endoplasmic reticulum?

A cell is unable to properly modify and sort proteins. Which organelle is most likely malfunctioning?

Which evidence supports the endosymbiont theory for the origin of mitochondria and chloroplasts?

A cell is unable to synthesize lipids. Which organelle is most likely defective?

Why are ribosomes not considered true organelles?