SME’s (tiny and mid-sized companies) who contract with answering products normally see immediate end results in profit and time. Virtual Cell Biology Lab Then, prepare a sample of onion cells to observe the phases of mitosis and find out how each phase contributes to the successful duplication of the cell. A structure composed of microtubules that guides the movement of chromosomes during mitosis and meiosis. By now, you will understand enough about mitosis to replicate the process in a computer model. Prometaphase The second stage of mitosis, in which the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the chromosomes. This is where to put text that browsers without frames support will display. Understand the different stages of mitosis through interactive graphics and quiz questions. Observing Mitosis Lab Answers The perks of contracting by having an answering services are generally expanded to smaller institutions.