Mitosis Chapter 12

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Questions and Answers

What is the primary reason why cell division is necessary for living organisms?

  • to synthesize proteins
  • to respond to environmental stimuli
  • to reproduce and ensure continuity of life (correct)
  • to produce energy for the cell

What is the main distinction between living and nonliving matter?

  • ability to respond to stimuli
  • ability to produce more of their own kind (correct)
  • ability to move
  • ability to maintain homeostasis

What is the role of cell division in unicellular organisms?

  • it reproduces the entire organism (correct)
  • it responds to environmental stimuli
  • it helps in growth and development
  • it aids in tissue renewal

What is the role of cell division in multicellular eukaryotes?

<p>it is necessary for development, growth, and repair (A)</p> Signup and view all the answers

What is the process by which cells reproduce?

<p>mitosis (A)</p> Signup and view all the answers

What is the term for the life of a cell from formation to its own division?

<p>cell cycle (A)</p> Signup and view all the answers

What appears to drive the cell cycle?

<p>Specific chemical signals present in the cytoplasm (C)</p> Signup and view all the answers

What happens when a G1 nucleus is fused with an S phase nucleus?

<p>The G1 nucleus immediately enters S phase (D)</p> Signup and view all the answers

What is the cell cycle control system similar to?

<p>A clock (B)</p> Signup and view all the answers

What regulates the cell cycle control system?

<p>Both internal and external controls (D)</p> Signup and view all the answers

What is the purpose of checkpoints in the cell cycle control system?

<p>To ensure the cell cycle stops until a go-ahead signal is received (C)</p> Signup and view all the answers

Where are the molecules that control the progression to S and M phases found?

<p>In the cytoplasm (A)</p> Signup and view all the answers

What is the result of most cell division?

<p>Genetically identical daughter cells (A)</p> Signup and view all the answers

What constitutes the cell's genome?

<p>All the DNA in a cell (B)</p> Signup and view all the answers

What is the characteristic of eukaryotic chromosomes?

<p>They are composed of chromatin and protein (C)</p> Signup and view all the answers

What is the number of chromosomes in gametes compared to somatic cells?

<p>Half as many (D)</p> Signup and view all the answers

What happens to DNA during preparation for cell division?

<p>It is replicated and the chromosomes condense (D)</p> Signup and view all the answers

What is the function of cohesins in sister chromatids?

<p>They attach the sister chromatids along their lengths (A)</p> Signup and view all the answers

What happens if a cell does not receive a go-ahead signal at the G1 checkpoint?

<p>It will exit the cell cycle and enter the G0 phase (D)</p> Signup and view all the answers

What is the purpose of the G1 checkpoint?

<p>To control cell growth and division (B)</p> Signup and view all the answers

What happens if all chromosomes are properly attached to the spindle at the metaphase plate?

<p>The cell will receive a go-ahead signal (D)</p> Signup and view all the answers

What is the result of a cell receiving a go-ahead signal at the G1 checkpoint?

<p>The cell will continue to the S, G2, and M phases (A)</p> Signup and view all the answers

What is the purpose of the M checkpoint?

<p>To ensure all chromosomes are properly attached to the spindle (A)</p> Signup and view all the answers

What is the result of a cell not receiving a go-ahead signal at the G1 checkpoint?

<p>The cell will enter the G0 phase (A)</p> Signup and view all the answers

What has led to advances in cancer treatment?

<p>Advances in understanding the cell cycle and cell cycle signaling (D)</p> Signup and view all the answers

What is the result of sequencing the DNA of cells in a particular tumor?

<p>More personalized treatments (A)</p> Signup and view all the answers

What is the purpose of the cell cycle?

<p>To regulate cell growth and division (D)</p> Signup and view all the answers

What phase of the cell cycle is characterized by the separation of sister chromatids?

<p>Mitosis (A)</p> Signup and view all the answers

What is the result of the cell cycle?

<p>A single cell becomes two identical daughter cells (C)</p> Signup and view all the answers

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