Cellular Effects of Radiation Practice Questions

Question 1

What is the repair mechanism associated with CRISPR-cas9?

Accepted Answer

Non-homologous end joining

Answer

Mismatch repair

Answer

Nucleotide excision repair

Answer

Base excision repair

Question 2

Which of the following is most susceptible to ionizing radiation?

Accepted Answer

Small lymphocytes

Answer

Nerve cells

Answer

Epithelial cells

Answer

Mature bone

Question 3

Cancer patient undergoes radiotherapy, pick the true statement for radiosensitivity of tissues?

Accepted Answer

Small blood vessels are radiosensitive tissues

Answer

GI mucosa is one of the most radioresistant tissues in the body

Answer

Rapidly dividing cells are resistant to radiation

Answer

The intensity of radiation is inversely proportional to the square of distance from the source

Question 4

Which phase of the cell cycle does not have a fixed duration?

Accepted Answer

G1 phase (cell growth)

Answer

S phase (DNA synthesis)

Answer

M phase (mitosis)

Answer

G2 phase (preparation for mitosis)

Question 5

Mutations are due to changes in:

Accepted Answer

DNA nucleotide sequence

Answer

RNA nucleotide sequence

Answer

Amino acid sequence of ribonuclease

Answer

Cell membrane

Question 6

Which of the following is most harmful to an individual cell?

Accepted Answer

Alpha particles

Answer

X-rays

Answer

Beta particles

Answer

Gamma rays

Question 7

Which compound is not considered as a radiosensitizer?

Accepted Answer

Amifostine

Answer

Hyperbaric oxygen

Answer

Misonidazole

Answer

Idoxuridine

Question 8

When is oxygen effective during radiotherapy?

Accepted Answer

During and within microseconds of starting

Answer

Just before starting the therapy

Answer

After 5 minutes

Answer

After 10 minutes

Question 9

Which of the following is a stochastic effect of radiation?

Accepted Answer

Genetic mutation

Answer

Alopecia in the irradiated portal

Answer

Local desquamation in the irradiated field

Answer

All of the options

Question 10

What is the threshold radiation dose for the hematological syndrome?

Accepted Answer

2 Gy

Answer

6 Gy

Answer

15 Gy

Answer

50 Gy

Cellular Effects of Radiation — MCQs

Cellular Effects of Radiation — MCQs

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