Chapter 7- Molecular and Cellular Radiation
Biology Questions and Answers| Latest Update
T/F- Because hydrogen and hydroxyl ions usually recombine to form a normal water molecule,
the existence of these ions as free agents in the human body is insignificant in terms of biologic
damage. True
T/F- A cell survival curve is constructed from data obtained from a series of experiments.
True
T/F. The human body is composed of different types of cells and tissues, all of which have the
same degree of radiosensitivity. False
T/F. In radiation therapy the presence of oxygen is not significant in terms of radiosensitivity.
False
T/F. The more mature and specialized in performing functions a cell is, the more sensitive it is to
radiation. False
T/F- Radiation affects primarily the stem cell of the hematopoietic (blood-forming) system.
True
T/F- The higher the radiation dose to the bone marrow, the more severe is the resulting cell
depletion. True
Potentially harmful effects of ionizing radiation on living systems occur primarily at the
_______level Cellular
X-ray and gamma ray photons can impart ______to orbital electrons in atoms if the photons
happen to pass near the electrons. energy
, Low-LET radiation generally causes _____ damage to DNA. sublethal
High LET radiation includes particles that possess substantial _____and _____ mass;
charge
High-LET radiation is of greatest concern when _____contamination is possible internal
The presence of oxygen in biologic tissues makes the damage produced by free radicals _____
permanent
Approximately two-thirds of all radiation induced damage is believed to be ultimately caused by
the ______free radical (OH*) hydroxyl
_____mutations could result from a single alteration along the sequence of nitrogenous bases
in DNA. Gene
_______of the individual cell governs the dose required to cause apoptosis
Radiosensitivity
When ______ ________interacts with cell atoms and molecules, the amount of radiation
energy transferred (absorbed by the tissues) plays a major role in determining the extent of the
biologic response. ionizing radiation
Neutrophils, a type of white blood cell, play an important role in fighting _____ infection
Thrombocytes, or _____, initiate blood clotting and prevent hemorrhage. platelets
_______initially respond to radiation by increasing in number Granulocyctes
Biology Questions and Answers| Latest Update
T/F- Because hydrogen and hydroxyl ions usually recombine to form a normal water molecule,
the existence of these ions as free agents in the human body is insignificant in terms of biologic
damage. True
T/F- A cell survival curve is constructed from data obtained from a series of experiments.
True
T/F. The human body is composed of different types of cells and tissues, all of which have the
same degree of radiosensitivity. False
T/F. In radiation therapy the presence of oxygen is not significant in terms of radiosensitivity.
False
T/F. The more mature and specialized in performing functions a cell is, the more sensitive it is to
radiation. False
T/F- Radiation affects primarily the stem cell of the hematopoietic (blood-forming) system.
True
T/F- The higher the radiation dose to the bone marrow, the more severe is the resulting cell
depletion. True
Potentially harmful effects of ionizing radiation on living systems occur primarily at the
_______level Cellular
X-ray and gamma ray photons can impart ______to orbital electrons in atoms if the photons
happen to pass near the electrons. energy
, Low-LET radiation generally causes _____ damage to DNA. sublethal
High LET radiation includes particles that possess substantial _____and _____ mass;
charge
High-LET radiation is of greatest concern when _____contamination is possible internal
The presence of oxygen in biologic tissues makes the damage produced by free radicals _____
permanent
Approximately two-thirds of all radiation induced damage is believed to be ultimately caused by
the ______free radical (OH*) hydroxyl
_____mutations could result from a single alteration along the sequence of nitrogenous bases
in DNA. Gene
_______of the individual cell governs the dose required to cause apoptosis
Radiosensitivity
When ______ ________interacts with cell atoms and molecules, the amount of radiation
energy transferred (absorbed by the tissues) plays a major role in determining the extent of the
biologic response. ionizing radiation
Neutrophils, a type of white blood cell, play an important role in fighting _____ infection
Thrombocytes, or _____, initiate blood clotting and prevent hemorrhage. platelets
_______initially respond to radiation by increasing in number Granulocyctes
