Question

DNA replication is called semiconservative because.

a) Each new DNA molecule consists of one old strand and one newly synthesized strand.
b) Both DNA strands break and recombine to form a new double helix.
c) The entire DNA molecule is copied without any changes.
d) Only one strand of the DNA molecule is replicated during the process.

Answer 1

DNA replication is semiconservative because it produces two new DNA molecules, each with one old and one new strand, conserving half of the parental DNA in each new molecule.

Step-by-step explanation:

DNA replication is called semiconservative because each new DNA molecule consists of one old strand and one newly synthesized strand. During this process, DNA unwinds and each strand of the original double helix acts as a template for the new strand. This results in two DNA molecules, each with one original and one new strand, essentially conserving half of the parental DNA in each daughter molecule.

Moreover, DNA replication needs to be precise to ensure that new cells contain the same genetic material as the parent cells. To minimize mistakes, a DNA proofreading process involving special enzymes scans and corrects the new molecule. Once DNA replication is correctly completed, the cell can progress to division, distributing genetic material evenly between the daughter cells.