This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Acetyl CoA carboxylase enzyme is present in ? 
Select and explain. 
A. Cytosol, B. Mitochondria, C. Nucleus, D. Lysosome
A: Cytosol
Answer: A: Cytosol 
Explanation: Ans. is 'a' i.e., Cytosol This question is slightly different from previous one. The major acetyl CoA carboxylase which is involved in lipogenesis is acetyl CoA Carboxylase-1 (ACC-1). It is a cytosolic enzyme. In general acetyl CoA carboxylase refers to ACC-1. There is one more isoform of acetyl CoA carboxylase, i.e. ACC-2. Which is present in muscle, allowing muscle to regulate b-oxidation. ACC-2 is present in mitochondria.