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
Ubiquitin is a small protein present in 
Select and explain. 
A. All eukaryotes, B. All prokaryotes, C. Both 1 and 2, D. None of the above
A: All eukaryotes
Answer: A: All eukaryotes 
Explanation: None