X-Ray Certification Radiobiology

Question 1

What process occurs when radiation removes electrons from atoms, creating ion pairs that can damage biological molecules?

Accepted Answer

Ionization

Answer

Ionization is the process by which radiation removes electrons from atoms, creating charged ion pairs that can disrupt biological molecules such as DNA.

Question 2

Which phase of the cell cycle is considered most radiosensitive?

Accepted Answer

M phase (mitosis)

Answer

Cells in M phase (mitosis) are most radiosensitive because chromosomes are condensed and there is minimal time for DNA repair before division occurs.

Question 3

Which law states that the most radiosensitive cells are those that are rapidly dividing and least differentiated?

Accepted Answer

Bergonié-Tribondeau law

Answer

The Bergonié-Tribondeau law states that radiosensitivity is directly proportional to reproductive activity and inversely proportional to the degree of differentiation.

Question 4

What is the primary target molecule for radiation-induced biological damage in human cells?

Accepted Answer

DNA

Answer

DNA is the critical target molecule because damage to the genetic code can result in cell death, mutation, or carcinogenesis that cannot be easily repaired.

Question 5

Which organ system is considered most radiosensitive in the human body?

Accepted Answer

Hematopoietic (blood-forming) system

Answer

The hematopoietic system is most radiosensitive because bone marrow stem cells are rapidly dividing and undifferentiated, satisfying the Bergonié-Tribondeau criteria.

X-Ray Certification Practice Test

X-Ray Certification Practice Test

X-Ray Certification Radiobiology