The investigative question that would focus on the steps of the process of exploring the microscopic building of proteins from RNA would start with a 'how'. This is because how questions ask about the process. For example, 'How are proteins built from RNA?' would be a good investigative question.
HCL is guilty for triggering the release of enzymes such as pepsin which are essential for the digestion of protein. Bile contains bile acids, which are critical for digestion and absorption of fats and fat-soluble vitamins in the small intestine.