Week 7

Question 1

Which of the following cellular properties would make the cell more susceptible to damage by ionizing particles?
-Cellular division throughout a major portion of the organisms lifetime
-High rate of mitosis
-Lack of specialization in a cellular developmental sequence
-All of the above would make the cell more susceptible to damage

Answer 1

All the above would make the cell more susceptible to damage

Question 2

In Part 7.2.2 of the experiment, a pair of students measure the signal from a cobalt source for 10 sec and find C = 25 counts. They decide to repeat the measurement, but this time read only C = 20 counts. What is wrong?

Answer 2

Nothing is wrong; there is a certain amount of statistical uncertainty in the measurement

Question 3

What factors affect the biological half-life?
-Mode of intake
-Water solubility of material
-Size of particle
-All of the above affect the biological half-life

Answer 3

All of the above affect the biological half-life

Question 4

Which of the following safety rules should you follow when working with radioactive substances?
-When counting samples, do not stand beside the source.
-Wash your hands following the laboratory
-Mouth pipetting, eating, drinking, and smoking are prohibited.
-Return all sources to the closed, labeled container handled by your T.A.
-All of the above

Answer 4

All the above

Question 5

Why are the similarities of cesium to potassium and strontium to calcium important?

Answer 5

They are readily assimilated into the body, INCREASING the amount of radiation damage.

Question 6

Which of the following is NOT an example of a type of molecular change within the cell typically leading to cellular damage?

Answer 6

A hydrogen radical and a hydroxyl radical combining to form a water molecule.