Biology 11.3 Quiz

When does the mitosis-promoting factor (MPF) Cyclin concentration decline during a typical cell cycle in clam eggs?

• when the cells grow larger

• when DNA is synthesized

• when haploid gametes are produced

• when the cell nucleus divides

How does apoptosis relate to cancer cells?

• In cancer cells, too much apoptosis occurs, resulting in malignant cells that will not undergo programmed cell death.

• In cancer cells, too little apoptosis occurs, resulting in malignant cells that will not undergo programmed cell death.

• In cancer cells, apoptosis occurs only when cells grow without proper regulation.

• In cancer cells, apoptosis occurs only when the cells receive the proper hormones.

Which statement BEST describes the relationship between MPF and the cell cycle?

• Cyclin binds with an enzyme to produce MPF Cyclin and as its concentration rises, it promotes mitosis.

• Cyclin binds with a factor to produce MPF enzyme and as the enzyme's concentration decreases it promotes mitosis.

• The MPF Cyclin concentration remains constant, as the rise and fall of the MPF enzyme controls the cell cycle.

• The MPF Cyclin concentration increases and decreases in a cycle, but does not control the cell cycle.

Why are cancer cells harmful? Choose three correct answers.

• They stop cell growth and division

• They block nerve connections

• They prevent organs from functioning properly

• They absorb nutrients needed by other cells

Which of the following are functions of external regulators of the cell cycle? Select two answers.

• regulate checkpoints

• make sure chromosomes have replicated

• speed up or slow down the cell cycle

• stop the cell cycle

What is the relationship between mutation, the cell cycle, and cancer? Select all statements that apply.

• Mutated, defective genes may cause cells to become unable to respond to signals that regulate the cell cycle.

• As a result of unregulated cell cycles, cells may become cancerous, meaning that the cells grow and divide uncontrollably.

• Mutated genes typically allow cells to respond to checkpoint proteins that halt the cell cycle, thus avoiding formation of tumors.

• Cancerous cells may form malignant tumors that invade and destroy surrounding healthy tissue.