Why is the process of copying dna called semiconservative replication? each strand is a mixture of old and new nucleotides. one strand runs from 5’ to 3’ and the other runs from 3’ to 5’. the process happens very slowly to conserve energy. the two new dna molecules are formed from one old strand and one new strand of dna.

DNA replication is semi-conservative because each helix that is created contains one strand from the helix from which it was copied. The replication of one helix results in two daughter helices each of which contains one of the original parental helical strands

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.