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Radiation Biology Exam 1 Prep Questions With
Correct Answers 100% Verified.
Dividing the radiation doses into split fractions has less effect on cell survival for neutrons (high
LET) compared to photon radiation
True or False - Answer✔True
What is the recommended time required between radiation doses in order to allow for
reassortment of the cell population to enter a new radiosensitive cell phase?
4 hours
24 hours
6 hours
2 hours - Answer✔6 hours
Which stage of mitosis is most variable amongst mammalian cells?
G1
G2
S
Z - Answer✔G1
Which cell cycle stage is OER highest in?
G1
S
G2
Z - Answer✔S
What is the prominent HDR source used today?
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
Iridium-192
Cesium-137
Iodine-125
Iodine-131 - Answer✔Iridium-192
A decrease in dose rate has decreased cell survival
True or False - Answer✔False
An increase in dose rate for Iridium-192 HDR applications improves local recurrence rates
True or False - Answer✔True
Fractionated doses allow for better repair for multiple-track damage
True or False - Answer✔True
Which phase of the cell cycle is most resistant?
G1
S
G2
M - Answer✔S
Which phase of the cell cycle is associated with the molecular checkpoint gene? - Answer✔G2
Which of the following categories of mammalian cells is the most radioresistant?
Differentiating Intermitotic Cells
Vegetative Intermitotic Cells
Reverting Postmitotic Cells
Fixed Postmitotic Cells - Answer✔Fixed Postmitotic Cells
What was the distance for oxygen diffusion discovered by Thomlinson and Gray in their
research?
10 micrometers
300 micrometers
50 micrometers
150 micrometers - Answer✔150 micrometers
2
Radiation Biology Exam 1 Prep Questions With
Correct Answers 100% Verified.
Dividing the radiation doses into split fractions has less effect on cell survival for neutrons (high
LET) compared to photon radiation
True or False - Answer✔True
What is the recommended time required between radiation doses in order to allow for
reassortment of the cell population to enter a new radiosensitive cell phase?
4 hours
24 hours
6 hours
2 hours - Answer✔6 hours
Which stage of mitosis is most variable amongst mammalian cells?
G1
G2
S
Z - Answer✔G1
Which cell cycle stage is OER highest in?
G1
S
G2
Z - Answer✔S
What is the prominent HDR source used today?
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
Iridium-192
Cesium-137
Iodine-125
Iodine-131 - Answer✔Iridium-192
A decrease in dose rate has decreased cell survival
True or False - Answer✔False
An increase in dose rate for Iridium-192 HDR applications improves local recurrence rates
True or False - Answer✔True
Fractionated doses allow for better repair for multiple-track damage
True or False - Answer✔True
Which phase of the cell cycle is most resistant?
G1
S
G2
M - Answer✔S
Which phase of the cell cycle is associated with the molecular checkpoint gene? - Answer✔G2
Which of the following categories of mammalian cells is the most radioresistant?
Differentiating Intermitotic Cells
Vegetative Intermitotic Cells
Reverting Postmitotic Cells
Fixed Postmitotic Cells - Answer✔Fixed Postmitotic Cells
What was the distance for oxygen diffusion discovered by Thomlinson and Gray in their
research?
10 micrometers
300 micrometers
50 micrometers
150 micrometers - Answer✔150 micrometers
2
