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slega [8]
4 years ago
6

Another page... really need help ASAP

Biology
1 answer:
myrzilka [38]4 years ago
8 0

18) Cell B to cell A because the receptors of cell A are able to recognize the signals from cell B (signal 1). (3)

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Nucleotides play different roles such as being the building blocks of nucleic acids, energy storage, cellular signaling, enzymatic cofactors, etc.

  • Nucleotides are the building blocks of nucleic acids (either DNA or RNA).

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