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              adenine
               基礎(chǔ)科學(xué) 
              
				
              

					 
                      One of the four major bases found in nucleic acids. Adenine and guanine are purines; cytosine,thymine,and uracil are pyrimidines. These nitrogenous bases are a component of the basic building blocks of nucleic acids called nucleotides. Within the DNA doub......（本文共 365 字）      [閱讀本文] >> 
               
			  
				 
              
				 
				
				
              
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