DNA replication is called semiconservative because

DNA replication is called semiconservative because

Multiple choice question.

both strands of a DNA double helix are composed of a mosaic of parent and daughter segments of DNA.

both strands of a new DNA double helix are newly synthesized.

one strand of a new DNA double helix is composed of RNA nucleotides and the other strand is composed of DNA nucleotides.

one strand of a new DNA double helix is newly synthesized and the other strand is from the parent molecule.

The Correct Answer and Explanation is :

The correct answer is: “one strand of a new DNA double helix is newly synthesized and the other strand is from the parent molecule.”
Explanation:

DNA replication is termed “semiconservative” because, during the replication process, each of the two resulting DNA molecules consists of one original (parental) strand and one newly synthesized strand.his means that each new DNA molecule conserves half of the original DNA molecule.he term “semiconservative” reflects this conservation of one strand from the original DNA molecule in each of the new molecules.
Mechanism of Semiconservative Replication:

1. Unwinding of the DNA Double Helix: he double-stranded DNA molecule unwinds, and the two strands separate, creating two single-stranded templates.
2. Synthesis of New Strands: ach single-stranded template serves as a template for the synthesis of a new complementary strand.NA polymerase enzymes add nucleotides to the growing strand, following base-pairing rules (adenine with thymine, and cytosine with guanine).
3. Formation of Two DNA Molecules: fter replication, two DNA molecules are formed.ach molecule consists of one original (parental) strand and one newly synthesized strand.his results in two identical DNA molecules, each conserving half of the original DNA molecule.
   Experimental Evidence:

he semiconservative nature of DNA replication was confirmed by the Meselson–Stahl experiment in 1958.n this experiment, Escherichia coli bacteria were grown in a medium containing heavy nitrogen (^15N), which was incorporated into their DNA.he bacteria were then transferred to a medium containing normal nitrogen (^14N) and allowed to replicate.fter one generation, the DNA was found to have an intermediate density, indicating that each DNA molecule consisted of one heavy (parental) strand and one light (newly synthesized) strand.fter two generations, two bands were observed: one with intermediate density and one with light density, further supporting the semiconservative model.citeturn0search10
his experiment provided strong evidence that during DNA replication, each new DNA molecule conserves one of the original strands, supporting the semiconservative model of DNA replication.