The textbook presents a very simple, linear scheme of the central dogma of molecular biology (text page 500), but is explicit in noting the simplicity of the original concept and exceptions to it. Which of the following would NOT be reasonable additions or modifications that could be made to this simple linear scheme to account for experimental data? The textbook presents a very simple, linear scheme of the central dogma of molecular biology (text page 500), but is explicit in noting the simplicity of the original concept and exceptions to it. Which of the following would NOT be reasonable additions or modifications that could be made to this simple linear scheme to account for experimental data?

A. The arrow between DNA and RNA could be reversible.
B. The word "protein" should be made plural (i. e., "proteins").
C. The scheme could be made circular by adding an arrow connecting "protein" to "DNA replication."
D. RNA can be used to generate RNA-based enzymes (ribozymes), so "protein" at the end of the scheme should be changed to "protein/RNA."