DNA is the ultimate control of cell's productions. So A.
Answer:
In their experiments, Hershey and Chase showed that when bacteriophages, which are composed of DNA and protein, infect bacteria, their DNA enters the host bacterial cell, but most of their protein does not. Hershey and Chase and subsequent discoveries all served to prove that DNA is the hereditary material.
The correct answer is: 2.metaphase.
Mitosis is a process of cell division and it is separatd into phases.
• Interphase-DNA replication (two identical full sets of chromosomes),
• Prophase-chromosomes composed of two sister chromatids with identical genetic information,
• Metaphase- chromosomes line up along the centre of the cell,
• Anaphase- chromatids are pulled apart by the mitotic spindle (one chromatid to one pole and the other chromatid to the opposite pole),
• Telophase- a full set of chromosomes at each pole of the cell.
