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FtsZ in bacteria and tubulin in eukaryotes are described as homologous. Which shared feature supports that?
ABoth use ATP to build and take apart structures
BBoth are found only inside a true nucleus
CBoth appear only during the S phase of growth
DBoth use GTP to build and take apart structures
Answer & Solution
Correct answer: D. Both use GTP to build and take apart structures
1. Homologous structures share a common evolutionary origin.
2. FtsZ and tubulin are similar in both structure and function.
3. FtsZ can form filaments and rings, much as tubulin forms microtubules.
4. Both proteins also draw on the same energy source, GTP.
5. That shared nucleotide lets both assemble and disassemble their structures quickly.
6. So FtsZ is treated as the ancestor protein and tubulin as the modern one.
7. Naming ATP swaps in the wrong nucleotide and loses the specific match.
8. Restricting either to a nucleus is wrong, since bacteria have no nucleus at all.
_Source: OpenStax Biology 1e (CC BY 4.0), Chs 10 and 11, section 10.5 Prokaryotic Cell Division_
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