Cell Cycle STAAR

Scientists determined the total mass of DNA from a sample of animal cells. The masses of equal numbers of cells were taken during three different stages of the cell cycle. Stage I contains cells massed during G1 of the cell cycle.

Which statement best describes the cells during Stage II?

• The cells have replicated their DNA, but have not completed mitosis and cytokinesis.

• The cells have completed mitosis and cytokinesis without replicating their DNA.

• The cells have replicated their DNA and completed mitosis and cytokinesis.

• The cells have temporarily exited the cell cycle without replicating their DNA.

Answer explanation

During Stage II, the cells have replicated their DNA, but have not completed mitosis and cytokinesis. Therefore, the mass of DNA is double the mass of the DNA in stages I and III.

Tags

NGSS.HS-LS1-4

Which model accurately shows a cell progressing through Mitosis?

• 
• 
• 
• 

Answer explanation

The stages of mitosis (prophase, metaphase, anaphase, and telophase) are in the correct sequence based on the model shown.

Tags

NGSS.HS-LS1-4

Normal cells that have a contact inhibition feedback mechanism that prevents the cells from replicating when other cells are touched. A diagram of cells with contact inhibition and cells without contact inhibition is shown. Which statement best describes what will happen to cells in an organism that lack contact inhibition?

• The cells will continue to grow, causing a tumor in the body.

• The cells will replicate normally, replacing body cells that die.

• The cells will replicate until the food supply for each cell is used, causing each cell to die.

• The cells will stop replicating once one layer is produced, as other body cells will crowd them out.

Answer explanation

Contact inhibition is a mechanism that stops the cell cycle and prevents cells from performing replication/proliferation and growth. The cells in an organism that lack contact inhibition will continue to replicate/proliferate and grow, and potentially lead to the development of tumors.

Tags

NGSS.HS-LS1-3

Which table best compares the events that occur during different stages of the cell cycle?

• 
• 
• 
• 

Answer explanation

DNA replication occurs during the S phase. Nuclear division occurs during the M phase.

Tags

NGSS.HS-LS1-4

Identify the Cell Cycle Stage.

• Cytokinesis

• Interphase

• Anaphase

• Metaphase

Tags

NGSS.HS-LS1-4

Identify the Cell Cycle Stage.

• Interphase

• Anaphase

• Telophase

• Prophase

Tags

NGSS.HS-LS1-4

What is happening in this picture? Hint: What is dividing?

• mitosis

• interphase

• cytokinesis

Tags

NGSS.HS-LS1-4

Cyclins signal cells to progress through stages of cell replication. Uncontrolled production of cyclins will most likely result in...

• the formation of haploid cells

• transfer of cyclins to other cells

• formation of tumors

• death of the cell

Tags

NGSS.HS-LS1-4

Which best explains how the cell cycle is important to the life cycle of a frog?

• it enables frogs to produce tadpoles that are clones

• it allows frogs to grow, develop, and reproduce

• it prevents overproduction of frog offspring

• it ensures the best adapted frogs survive and pass on traits to offspring

Tags

NGSS.HS-LS1-2

NGSS.HS-LS1-4

This model of the cell cycle includes two arrows that each represents a process in the cycle. Which Arrow Represents Mitosis?

Tags

112.34.c.5.A