Cancer occurs when:

The G1 checkpoint prevents the cell cycle from continuing until:

When normal cells are grown in a dish, they stop dividing when they touch one another and become a one-cell-thick sheet. This property is called __ ___. Cancer cells do not display this property.

Down syndrome in a male is associated with which of the following karyotypes?

The ability of cancer cells to cause new blood vessels to form is called ___.

All of the following occur during prophase EXCEPT:

The structure labeled “b” in the diagram is ___.

The structure labeled “c” in the diagram is called the ___.

A tumor that stays at its site of origin and does not invade adjacent tissue is called a ___ tumor.

The type of cancer treatment that involves using drugs such as Taxol or vinblastine to attack actively dividing cells is called ___.