Question

Which eukaryotic cell-cycle event is missing in Binary Fission?

• A. Cell growth
• B. DNA duplication
• C. Cytokinesis
• D. Mitosis

Hint:

Remember the key difference: Binary fission is simple division in prokaryotes (no nucleus). Mitosis is complex nuclear division in eukaryotes (have a nucleus). If there's no nucleus, there can't be mitosis.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The question asks to identify a process from the eukaryotic cell cycle that does not occur in binary fission. Binary fission is the method of asexual reproduction used by prokaryotic organisms like bacteria. The eukaryotic cell cycle is the process by which eukaryotic cells divide.

Step 2: Detailed Explanation:
Let's compare the events in binary fission and the eukaryotic cell cycle:
\[\begin{array}{rl} \bullet & \text{Cell growth: Both prokaryotic cells undergoing binary fission and eukaryotic cells undergoing division first grow in size. This event is present in both. } \\ \bullet & \text{DNA duplication: Both prokaryotes and eukaryotes must duplicate their genetic material before dividing to ensure each daughter cell receives a copy. This event is present in both (replication of the circular chromosome in prokaryotes, and replication of linear chromosomes in S phase for eukaryotes). } \\ \bullet & \text{Cytokinesis: This is the division of the cytoplasm to form two separate daughter cells. This event occurs at the end of both binary fission and the eukaryotic cell cycle. } \\ \bullet & \text{Mitosis: This is the complex process of nuclear division, where the duplicated chromosomes are precisely segregated into two daughter nuclei. This process is characteristic of eukaryotes, which have a nucleus. Prokaryotes lack a nucleus, so they do not undergo mitosis. } \\ \end{array}\] Therefore, mitosis is the eukaryotic cell-cycle event that is absent in binary fission.

Step 3: Final Answer:
The eukaryotic cell-cycle event missing in Binary Fission is Mitosis.