[单选题]
What does the phrase nderb6n)f 1goqlt 0;d; cer 5)‘the genetic code is universal’ mqm- x0syu /3vcean?
A. Adenine always pairs with thymine, and guanine always pairs with cytosine
B. Almost all living organisms use the same genetic code
C. Different codons cannot code for the same amino acid
D. Proteomes are always larger than the genomes