Answer: Cytosine is most likely found in the cell's DNA because it is one of the four nitrogenous bases found in DNA (option a).
Step-by-step explanation:
DNA, or deoxyribonucleic acid, is the genetic material that carries the instructions for the development and functioning of all living organisms. It consists of a double helix structure made up of nucleotides. Each nucleotide consists of a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base.
There are four types of nitrogenous bases found in DNA: adenine (A), thymine (T), guanine (G), and cytosine (C). These bases pair up with each other in a specific manner: adenine with thymine and guanine with cytosine. This pairing is crucial for the stability and replication of DNA.
Cytosine specifically forms hydrogen bonds with guanine, creating a complementary base pair. This pairing is known as a "C-G" base pair. The sequence of these base pairs along the DNA molecule forms the genetic code that determines the characteristics and functions of an organism.
Therefore, cytosine is most likely found in the cell's DNA because it is one of the four nitrogenous bases that make up the genetic code. It plays a crucial role in maintaining the structure and function of DNA, allowing for accurate transmission of genetic information from one generation to the next.