Final answer:
The enzyme Ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO) is located in the chloroplasts of plant cells, specifically in the stroma, where it plays a vital role in the Calvin cycle of photosynthesis.
Step-by-step explanation:
The enzyme Ribulose 1,5-bisphosphate carboxylase/oxygenase, commonly known as RuBisCO, is located in the chloroplasts of plant cells. RuBisCO is a crucial enzyme in the process of photosynthesis, specifically in the Calvin cycle, where it catalyzes the first major step of carbon fixation. The enzyme facilitates the reaction between carbon dioxide (CO2) and ribulose bisphosphate (RuBP), leading to the production of organic compounds that are further processed to synthesize sugars. Thus, the correct answer to the question is a) Chloroplasts.
The enzyme RuBisCO is found in high concentrations in the stroma of the chloroplasts, where the light-independent reactions of photosynthesis, also known as the Calvin cycle, occur. It is not located in the mitochondria, nucleus, or endoplasmic reticulum. Additionally, the RNA components of ribosomes are synthesized in the nucleolus, which is another question students might encounter regarding cell organelles and their functions.