What is a small DNA part carrying information for a specific protein called?

Correct answer: Gene

Direct answer: Option A, gene, is correct. A gene is a particular stretch of DNA that contains hereditary information. That information may provide instructions for making a specific protein or may help determine a characteristic or trait through a biological process. Start from the basic idea: DNA is a long molecule made of information-bearing sequences; a gene is one meaningful information unit within that DNA. When a gene is expressed, its information can be copied into RNA and used in producing a protein, although not every gene directly codes for a protein. Option A is therefore the scientifically appropriate term. Option B, water, is a substance and not an information-carrying DNA segment. Option C, lipid, is a type of biological molecule used in membranes and other functions, not the name of a DNA information unit. Option D, mineral, is an inorganic nutrient or material and cannot mean a coded region of DNA. The wording says “for a specific protein,” so gene is the expected answer, even though genes may also code for functional RNA. Memory cue: DNA is the information library; a gene is one instruction or entry in that library.