Which checkpoint makes sure that the cell has appropriate growth before the DNA replicated accurately

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem

The basic repeating unit of nucleic acids are known as nucleotides. a nucleotide consists of three distinct chemical groups.

C) they are specialized meaning they are designed to do different things