In a dividing cell, the chromosomes are lined up in a single row across the middle of the cell, each one attached to fibers reaching to both ends. Which phase is this?

A cell no longer has a nuclear envelope. Its chromosomes are short, thick and scattered through the cytoplasm, and fibers are extending toward them from opposite ends of the cell. Which phase is this?

In a dividing cell, each chromosome has just split at its centromere and the two identical strands are being drawn steadily toward opposite ends of the cell. Which phase is this?

A cell has two separate groups of chromosomes, one at each end. The chromosomes are uncoiling and becoming harder to see, and a membrane is closing around each group. Which phase is this?

A cell is growing, carrying out its normal jobs, and copying its DNA. Its genetic material looks like long thin threads and no separate chromosomes can be picked out. What stage is the cell in?

During which phase of mitosis does the nuclear envelope break apart, so that the spindle fibers can reach the chromosomes?

A dividing cell pauses at a checkpoint until every chromosome is attached to spindle fibers from both poles. During which phase does this check happen?

An animal cell has a nucleus at each end and its cell membrane is pinching inward all the way around the middle, forming a deep groove. What is happening to this cell?

In a dividing animal cell the nucleolus has disappeared, the chromatin has coiled into visible chromosomes, and the centrioles are moving apart toward opposite ends of the cell. Which phase is this?

In an onion root tip cell, the chromosomes have already reached the two ends and a flat plate is now being built across the middle of the cell, where a new wall will appear. What is happening?

For a short time a dividing cell contains twice as many separate chromosomes as it started with, and each of them is a single strand. Half are near one pole and half are near the other. Which phase is this?

Each chromosome is copied so that it consists of two identical chromatids joined together. When in the cell cycle does this copying take place?

Look at the cell. Its chromatids have been pulled apart and are travelling toward opposite ends. Which of these happens next?

Look at the cell. Which event happens immediately after the arrangement shown here?

Look at the cell. What happens next in this cell?

Look at the cell. Which event normally comes next?

Look at the onion root tip cell under the microscope. Which phase came immediately before the one shown here?

Look at the onion root tip cell under the microscope. Which phase came immediately before the one shown here?

Look at the onion root tip cell under the microscope. Which list gives the phases that follow the one shown, in the correct order?

Look at the onion root tip cell under the microscope. Which phase happened two phases before the one shown here?

Look at the drawing of a cell. Which phase does it show?

Look at the cell under the microscope. Which phase does it show?

Look at the cell under the microscope. Which phase does it show?

Look at the drawing of a cell. Which phase does it show?

Look at the drawing of a cell. Which stage does it show?

Look at the plant cell under the microscope. Which process does it show?

Look at the drawing of the cell. Which statement is true of it?

Look at the cell under the microscope. Which statement best describes what its chromosomes are doing?

Two identical copies of a chromosome stay joined at one point until they are separated during division. What is that joining point called?

In an animal cell, which structures move to opposite ends of the cell and organize the fibers that will move the chromosomes?

After a chromosome has been copied, it consists of two identical strands joined together. What are those two strands called?

A cell is treated with a drug that stops spindle fibers from forming. Which event can no longer take place?

Look at the drawing. Thin protein threads run from each end of the cell to the chromosomes in the middle. What are those threads called?

Look at the cell under the microscope. Each moving body is now a single strand. What was each one joined to just before it started moving?

Look at the animal cell. Its membrane is pinching inward around the middle to split the cytoplasm. Which structure does the same job in a dividing plant cell?

A human cell containing 46 chromosomes completes mitosis and cytokinesis. What is produced?

Which cells in a person's body are produced by mitosis?

Look at the cell under the microscope. When it finishes dividing, how will the DNA in the two new cells compare with the DNA of the original cell?

Look at the cell. It came from an organism whose body cells each contain 12 chromosomes. Once this division and cytokinesis are complete, how many chromosomes will each new cell contain?

Look at the onion root tip cell under the microscope. Root tips are used to study mitosis because their cells divide constantly. What does that division accomplish for the root?