WorksheetsCh 11.3 QUIZ
Total questions: 10
Worksheet time: 5mins
Humans and other animals regulate cell growth and cell division. In humans, which of these types of cells generally do not divide after they have developed?
skin cells
cells of the lining of the digestive tract
cells in the bone marrow that generate blood cells
muscle cells and nerve cells
By regulating the cell cycle, multicellular organisms gain which of these benefits? Select all of the correct answers.
eliminating unnecessary genes
healing wounds effectively
replacing lost cells, such as shed skin cells
preventing communication among cells
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
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.
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.
A physician takes a biopsy, or tissue sample, from the skin of a patient. Which observation of the cells in the tissue would support the conclusion that the patient has skin cancer?
Many cells in the tissue sample appear identical to one another.
All of the cells are packed closely together.
Some of the cells were dead when the biopsy was obtained.
A group of cells appear larger and rounder than surrounding cells.
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 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.
High-energy radiation is often used to treat cancer. Which statement BEST explains why this treatment is effective?
The radiation kills cancer cells but leaves healthy cells intact.
The radiation is especially damaging to cancer cells because of their high rate of mitosis.
The radiation is especially damaging to cancer cells because of their genetic composition.
The radiation kills cancer cells and healthy cells equally, but is directed precisely at cancer cells.
