Pairing of a specific purine to a specific pyrimidine is due to the structure and properties of each ring and the three-dimensional fit between complements. Purine and pyrimidine are organic, aromatic ring compounds that act as the building blocks of nucleic acid. In DNA, purines occur as adenine and guanine, while pyrimidines occur as thymine and cytosine. In DNA base pairing, adenine pairs with thymine, and guanine pairs with cytosine
I believe it's B from my knowledge
<span>Plants are the key to removing carbon dioxide from the atmosphere, and plants need water to survive. Plants take up water from precipitation and ground water sources. They use this in the process of photosynthesis, where carbon dioxide and sunlight are used to make oxygen and sugar.
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Answer:
D
Explanation:
it regulates the flow of water into the cell
Answer is C transitional fault
