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: Core Idea:
The question focuses on a cell cycle process in eukaryotes that's absent in binary fission. Binary fission is how prokaryotes (like bacteria) reproduce asexually. The eukaryotic cell cycle describes how eukaryotic cells divide.

Step 2: Breakdown:
Let's contrast binary fission and the eukaryotic cell cycle:
\[\begin{array}{rl} \bullet & \text{Cell growth: Both prokaryotes and eukaryotes grow before dividing. This happens in both.} \\ \bullet & \text{DNA duplication: Both prokaryotes and eukaryotes duplicate their DNA before division. This ensures each new cell gets a copy (circular chromosome replication in prokaryotes, linear chromosome replication in S phase for eukaryotes).} \\ \bullet & \text{Cytokinesis: This is the cytoplasm splitting to create two cells. It occurs in both binary fission and the eukaryotic cell cycle.} \\ \bullet & \text{Mitosis: This is the complex process of nuclear division, where duplicated chromosomes are precisely separated into two nuclei. This is unique to eukaryotes (which have a nucleus). Prokaryotes lack a nucleus, so they don't do mitosis.} \\ \end{array}\]Therefore, mitosis is the eukaryotic cell-cycle event that's missing in binary fission.

Step 3: Answer:
The eukaryotic cell-cycle event NOT present in Binary Fission is Mitosis.