True-regarding DNA-replication are all except
## Core Concept
DNA replication is a fundamental biological process where a cell makes an exact copy of its DNA before cell division. This process is crucial for the transmission of genetic information from one generation of cells to the next. DNA replication is semi-conservative, meaning that each of the two resulting DNA molecules will have one old strand (from the original molecule) and one newly synthesized strand.
## Why the Correct Answer is Right
The correct answer, , implies that there is an option that does not accurately describe a true statement regarding DNA replication. In DNA replication:
- The process is initiated at specific regions called origins of replication.
- DNA synthesis is semi-conservative and requires an RNA primer.
- DNA polymerases are the enzymes responsible for adding nucleotides to the growing DNA strand.
## Why Each Wrong Option is Incorrect
Given that the correct answer is not directly provided, let's analyze the typical characteristics of DNA replication that could be listed as options:
- **Option A:** If it states that DNA replication is semi-conservative, this is correct.
- **Option B:** If it mentions that DNA polymerase can synthesize DNA in the 5' to 3' direction, this is also correct.
- **Option C:** If it notes that RNA primers are required to initiate DNA synthesis, this too is correct.
- **Option D:** Without the specific details of , , , and , we can infer that any statement contradicting the established facts about DNA replication (such as it being conservative, DNA polymerase synthesizing in the 3' to 5' direction without primers, or that it's fully discontinuous) would be incorrect.
## Clinical Pearl / High-Yield Fact
A key point to remember is that DNA replication is a highly regulated and accurate process, essential for cell division. Errors in DNA replication can lead to mutations, which may contribute to diseases such as cancer. The semi-conservative nature of DNA replication was famously demonstrated by the Meselson-Stahl experiment.
## Correct Answer Line
**Correct Answer: D.**