Lecture 4
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Which of the following is the definition of reproductive integrity in the context of cell survival curves?

  • The ability of cells to divide indefinitely and generate a large clone of cells (correct)
  • The loss of the capacity for sustained proliferation in proliferating cells
  • The loss of a specific function in differentiated cells
  • The inability of cells to divide and inhibit further growth

What is the dominant mechanism of cell death in most cells?

  • Mitotic death (correct)
  • Reproductive death
  • Loss of proliferative capacity
  • Apoptosis

What is the mean lethal dose for the loss of proliferative capacity in proliferating cells?

  • Less than 2 Gy (correct)
  • More than 100 Gy
  • 2 Gy
  • Approximately 100 Gy

Which proteins monitor the cell cycle's progress and ensure accuracy?

<p>Checkpoint Proteins (D)</p> Signup and view all the answers

What is the significance of the cell cycle?

<p>Essential for growth, development, and tissue repair (B)</p> Signup and view all the answers

Which technique is used to produce synchronously dividing cell cultures?

<p>Mitotic Harvest Technique (D)</p> Signup and view all the answers

Which phase of the cell cycle shows the greatest resistance to radiation?

<p>Late S phase (D)</p> Signup and view all the answers

Which phase of the cell cycle is characterized by DNA replication?

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

What is the dose required to reduce the fraction of surviving cells to 37% in the effective dose-survival curve?

<p>D0 (A)</p> Signup and view all the answers

What is the dose required to kill 90% of the population in the effective dose-survival curve?

<p>D10 (D)</p> Signup and view all the answers

If a tumor contains 10^8 clonogenic cells, what total dose is required to give a 90% chance of tumor cure?

<p>62.1 Gy (A)</p> Signup and view all the answers

Which phase of the cell cycle is most resistant to radiation?

<p>DNA synthesis phase (S) (D)</p> Signup and view all the answers

What is the cycle time for resting mouse skin stem cells?

<blockquote> <p>200 hours (B)</p> </blockquote> Signup and view all the answers

Which phase of the cell cycle has the second peak of resistance to radiation?

<p>G1 (A)</p> Signup and view all the answers

Which repair mechanism is more faithful and occurs after replication in the S phase?

<p>Homologous recombinational repair (B)</p> Signup and view all the answers

Which of the following is NOT a mechanism of cell killing ?

<p>Bystander effect (C)</p> Signup and view all the answers

Which of the following is a characteristic of apoptosis?

<p>Cell shrinkage and fragmentation (D)</p> Signup and view all the answers

What is the equation for the surviving fraction in the multitarget model?

<p>SF = exp(-αD - βD^2) (A)</p> Signup and view all the answers

What is the relationship between radiosensitivity and apoptosis in mammalian cells?

<p>Radiosensitivity is directly correlated with apoptosis (B)</p> Signup and view all the answers

What does the α/β ratio in the linear-quadratic model indicate?

<p>The width of the shoulder in the survival curve (D)</p> Signup and view all the answers

What is the role of autophagy in irradiated cells?

<p>Autophagy promotes cell survival and generates nutrients and energy (D)</p> Signup and view all the answers

What is the cycle time for resting mouse skin stem cells?

<blockquote> <p>200 hours (B)</p> </blockquote> Signup and view all the answers

Which phase of the cell cycle is most resistant to radiation?

<p>DNA synthesis phase (S) (D)</p> Signup and view all the answers

Which type of radiation displays a straight-line curve in the survival curve, approximating exponential cell killing?

<p>X-rays (D)</p> Signup and view all the answers

Which repair mechanism is more faithful and occurs after replication in the S phase?

<p>Homologous recombinational repair (D)</p> Signup and view all the answers

What is the plating efficiency in the unirradiated control dish if 100 cells were seeded and there are 70 colonies after 7 days?

<p>70% (B)</p> Signup and view all the answers

What is the dose required to kill 90% of the population in the effective dose-survival curve?

<p>63% (A)</p> Signup and view all the answers

What is the equation for the surviving fraction in the multitarget model?

<p>$S = 1 - e^{-D/D_0}$ (C)</p> Signup and view all the answers

What is the relationship between radiosensitivity and apoptosis in mammalian cells?

<p>Radiosensitivity decreases with increased apoptosis (C)</p> Signup and view all the answers

What is the significance of the cell cycle?

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

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