B.5A The Cell cycle 🏖️

A diagram of a process that occurs during one of the stages of the cell cycle is shown.

Which answer choice best identifies the process illustrated and the stage of the cell cycle in which it occurs.

• Process: Replication

  Cell cycle stage: Interphase

• Process: Protein synthesis

  Cell cycle stage: Prophase

• Process: Crossing over

  Cell cycle stage: Metaphase

• Process: Cytokinesis

  Cell cycle stage: Anaphase

The images show a cell in various phases of mitosis

Which of these lists the phases in the order that they occur in mitosis?

• Z, Y, X, W

• X, W, Z, Y

• Z, X, W, Y

• X, Z, Y, W

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.

Which model accurately shows a cell progressing through mitosis?

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

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The life cycle of a frog is illustrated in the diagram.

Which statement best explains how the cell cycle is important to the life cycle of the 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.

The diagram shows major stages of the cell cycle and the percentage of time spent in each phase.

Which statement best describes why a cell spends the majority of its time in interphase?

• The cell is growing and carrying out processes such as metabolism and DNA replication.

• The cell is aging and processes are stopping as lysosomes clear dead cell matter away.

• The cell needs time to synthesize spindle fibers to complete mitosis.

• The cell needs time to complete cytokinesis.

Which of these properties is found only in cancer cells?

• Unregulated cell division

• Regulated gene expression

• Response to signals outside the cell

• Prescence of mitochondria

Normal cells have 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 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.

During the cell cycle, proteins called cyclins bind to enzymes that send signals for the cell to progress through the stages of cell replication. At the end of this cycle, the cyclins degrade to prevent further signaling for the cell to divide. Uncontrolled production of cyclins will most likely result in--

• the formation of tumors

• the immediate death of the cell

• the transfer of cyclins to other cells

• the formation of haploid cells