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State whether the following is true or false.
The last doubling of a tumour adds as much mass as all previous doublings combined.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: A

Each doubling adds as much as everything that came before it, which is a property of exponential growth. This is why a tumour can seem to appear suddenly after growing unnoticed for years. The early doublings involve numbers of cells far too small to detect.

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