1. Ellen is a scientist, and working in a lab at USDA. She has been asked to screen maize seeds for a possible contamination of carcinogenic compounds. She decided to use Ames Test. Her examining one set of samples (sample A) gave her higher bacteria content, than the other-only few bacteria plotted (sample B). What is she suppose to report to her lab note-book?
a. Sample A is carcinogenic
b. Sample B is carcinogenic
c. Neither A or B is carcinogenic
d. Both samples are carcinogenic.
2. What type of cancer asbestos cause?
a. Mesothelioma
b. Gastric carcinoma
c. Prostate cancer
d. None of the above
3. Which wave-length range is true for UVB?
a. 315-400nm.
b. 100-280nm.
c. 280-315nm.
d. None of the above.
4. UVB are absorbed by the DNA bases, imparting enough energy to alter chemical bonds. There is an incorrectly inserted A (Adenine), and makes a pair with, T, creating AT base pair. This unique type of mutation called:
a. Pyrimidine dimer
b. Purine dimer
c. Point mutation(caused by chemicals)
d. b and c
5. There has been disruption of water molecules, and observed free radicals, i.e., hydroxyl radicals (OH•). This is a:
a. Pyridine dimer mutation
b. UVB radiation.
c. Ionizing radiation
d. Purine mutation
6. A DNA virus implicated in cancer of the uterine cervix and in several other cancers of the anal and genital area, including cancer of the penis. This oncogenic virus can be:
a. EBV-Epstein-Barr virus
b. HPV-human papilloma virus
c. KSHV-Kaposi’s sarcoma
d. HBV-Hepatitis B virus.