A is the answer to the question you have
Purines have 2 rings pyrimidines have 1 ring.
Answer:
Explanation:
Boyle’s law is a gas law which states that the pressure exerted by a gas (of a given mass, kept at a constant temperature) is inversely proportional to the volume occupied by it. In other words, the pressure and volume of a gas are inversely proportional to each other as long as the temperature and the quantity of gas are kept constant. Boyle’s law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662.
The gene transfer process in bacteria is also commonly known as the "horizontal gene transfer." In this process, the DNA of a bacteria is transferred from one bacterium to another virus, through a plasmid from a donor cell to a recipient cell.
Defining a living thing is a difficult proposition, as is defining “life”—that property possessed by living things. However, a living thing possesses certain properties that help define what life is.a living thing is composed of one or more cells. These units, generally too small to be seen with the naked eye, are organized into tissues.