Regulation of gene expression very commonly involves transcriptional regulation. The most important significance of this is that it:
1. | is highly efficient at completely preventing transcription. |
2. | allows the cell to only produce proteins that are needed at the time. |
3. | can be induced by a repressor protein. |
4. | can be done only in prokaryotes. |
It is believed that all organisms have arisen from a single distant ancestor. The strongest evidence for this would be:
1. | DNA stores genetic information in all organisms. |
2. | The genetic code is universally a triplet code. |
3. | The amino acids specified by particular triplets are almost always identical between any two organisms. |
4. | The genetic code is degenerate but unambiguous. |
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