Cell Cycle STAAR questions

Checkpoints occur between the stages of the cell cycle. If a cell does not meet certain criteria at the end of a stage, it will not move to the next stage. Which of these occurs just before the cell enters the G stage of the cell cycle?

• The nuclear membrane disintegrates.

• DNA replicates.

• Centrioles form.

• The nucleolus divides.

Telophase is a stage of a cellular process that begins after the chromosomes have moved to opposite poles of the cell. During which cellular process does telophase occur?

• Translation

• Interphase

• Transcription

• Mitosis

Tags

NGSS.HS-LS1-4

When cells lose their ability to regulate the cell cycle, they can divide at an accelerated rate and form a mass of cells. This mass of cells is referred to as —

• a tumor

• an embryo

• a gland

• an organ

Tags

NGSS.HS-LS1-4

The diagram shows cells in different phases of mitosis. A student is trying to find a cell in a particular phase of mitosis. The student is looking for evidence that spindle fibers are separating the chromosomes to ensure that each new nucleus has one copy of each chromosome. Which cell is in the phase of mitosis that the student is searching for?

• Cell 1

• Cell 2

• Cell 3

• Cell 4

Tags

NGSS.HS-LS1-4

Cells pass through a G₂ checkpoint before entering mitosis. Ideally, if DNA damage is detected, the cells do not enter mitosis until the damage is repaired. Why is DNA damage repaired before cells enter mitosis?

• So that another round of DNA synthesis does not have to take place

• So that the chromosomes can align at the metaphase plate during mitosis

• So that the cytoplasm can be divided equally between the two daughter cells

• So that healthy daughter cells are produced, allowing the organism to continue growing

Tags

NGSS.HS-LS1-4

Cells typically respond to DNA damage in three ways: by ceasing to grow and divide until the damage is repaired, by permanently ceasing to grow and divide, or by dying. In 2010 a group of scientists reported that a certain kind of immune reaction can cause DNA damage that leads to a fourth response. DNA damage can turn off genes involved in cell-signaling pathways. Turning off these genes can cause less-mature cells to divide too rapidly, often leading to the development of

• tumors

• allergies

• hemophilia

• cardiovascular disease

Tags

NGSS.HS-LS3-2

Which of the following is a correct statement about the events of the cell cycle?

• Little happens during G1 and G2 phases of the cell cycle.

• DNA replicates during the S phase of interphase.

• Mitosis is usually the longest phase of the cell cycle when the cell is growing.

• Interphase consists of the G1, S, G2 phases, and mitosis.

A laboratory assistant was told to watch the mitosis of a eukaryotic cell under the microscope and inform the lead scientist when the cell entered prophase. What should the assistant expect to look for to indicate that the cell is in prophase?

• The chromosomes gather at opposite ends of the cell and uncoil, and then two new nuclear envelopes form around this genetic material.

• The sister chromatids separate into individual chromosomes and are moved apart.

• The chromosomes line up across the center of the cell, and each chromosome is connected to a spindle fiber.

• The chromatin condenses into chromosomes, the nuclear envelope breaks down, and a spindle begins to form.

Tags

NGSS.HS-LS1-4