What does DNA contain?

DNA contains the genes necessary for cell function, which serve as the fundamental units of heredity. Each gene is a specific sequence of nucleotides that encodes instructions for synthesizing proteins or for regulating other genes. These proteins are essential for the various functions and processes that occur within a cell, including metabolism, growth, and response to environmental signals. By providing the blueprint for these proteins, DNA plays a crucial role in determining the traits and functionalities of an organism.

The other options refer to various components related to cellular functions but do not encapsulate what DNA itself is composed of or what it specifically contains. For example, while proteins and enzymes are produced based on the instructions found within DNA, they are not part of the DNA structure itself. Similarly, organelles are specialized structures within cells that perform distinct roles, but they are not encoded directly by the DNA. Thus, the genes within DNA are what directly link to cell functionality.