Question

DNA replication in eukaryotes commences

• A. From centromere to either end
• B. From both ends of a chromosome simultaneously
• C. From one end of chromosome to the other
• D. Several sites along DNA of a chromosome simultaneously

Answer 1

The correct option is D Several sites along DNA of a chromosome simultaneously

Ori in eukaryotes
Eukaryotes have giant DNA molecules, so multiple origins of replication or ori form simultaneously in different parts of the chromosomal DNA, which results in several replicons. These eventually merge with each other once replication is under way. The replication of DNA is unidirectional as it takes place in the 5’ → 3’.
Final answer
b. Several sites along DNA of a chromosome simultaneously