NCEA Level 1 Genetics Practice Exam

DNA is the molecule that carries genetic information in cells. It serves as the instruction manual for the development, functioning, growth, and reproduction of all living organisms and many viruses. DNA is composed of two strands that coil around each other to form a double helix, and it is structured with sequences of nucleotides that encode the information needed to produce proteins, which are crucial for cell structure and function.

While RNA is indeed involved in the process of translating genetic information from DNA into proteins, it does not carry genetic information in the form of the organism's hereditary material. Instead, RNA primarily functions as an intermediary in protein synthesis. Proteins themselves are the products of gene expression and play various roles in cellular functions, but they do not contain or carry genetic information. The term "disease" does not pertain to genetic structures; it refers to medical conditions that may be influenced by genetic factors but are not a carrier of genetic information. Therefore, DNA is the correct answer as it is the primary carrier of genetic instructions in biological systems.