AP BIOLOGY

Detailed explanation-1: -DNA replication is semiconservative, meaning that each strand in the DNA double helix acts as a template for the synthesis of a new, complementary strand. This process takes us from one starting molecule to two “daughter” molecules, with each newly formed double helix containing one new and one old strand.

Detailed explanation-2: -It is true that each DNA molecule has one new and old strand but it doesn’t occur every other strand. Semiconservative replication produces copies of DNA that contain one of the original strands.

Detailed explanation-3: -The result of DNA replication is two DNA molecules consisting of one new and one old chain of nucleotides. This is why DNA replication is described as semi-conservative, half of the chain is part of the original DNA molecule, half is brand new.

Detailed explanation-4: -Each DNA molecule resulting from replication has one original strand and one new strand. DNA replication is carried out by a series of enzymes. Helicase is the enzyme that “unzips” a molecule of DNA by breaking the hydrogen bonds between base pairs and unwinding the two strands of the molecule.

Detailed explanation-5: -After replication, each DNA has one parental or “old” strand, and one daughter or “new” strand. Replication in eukaryotes starts at multiple origins of replication, while replication in prokaryotes starts from a single origin of replication.