The characteristics of all organisms and viruses are determined by the instructions carried in .?

The characteristics of all organisms and viruses are determined by the instructions carried in their genetic material, which is primarily composed of DNA or RNA. This genetic material encodes the information necessary for growth, development, reproduction, and functioning of the organism or virus. In organisms, DNA is organized into genes, while viruses may have a simpler structure with fewer genes that dictate their behavior and interactions with host cells. Ultimately, the sequences of nucleotides in this genetic material dictate the traits and functions of the organism or virus.