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1Electromagnetic radiation is used in the lab to mutagenize bacteria. Which type of wavelength do you think is used for this purpose?
A)Gamma rays and X rays
B)Ultraviolet light
C)Visible light
D)Infrared light


2Thymine dimers directly interfere with translation.
A)True
B)False


3What is a pyrimidine dimer?
A)A hydrogen bond between adjacent pyrimidines
B)An electrostatic bond between adjacent pyrimidines
C)An ionic bond between adjacent pyrimidines
D)A covalent bond between adjacent pyrimidines


4What had to occur in the B. megaterium cultures exposed to UV light for extended periods of time, in order for growth to appear on the plates after 24-48 hours?
A)Thymine dimers must not have formed during the exposure to UV light.
B)Endospores must have entered the vegetative cycle.
C)Bacterial cells must have been resistant to UV light


5If a bacterial culture growing on an agar plate was exposed to UV light at a wavelength of 254 nm for 10 minutes, and then a bacterial smear was made of the culture, would you expect to see bacterial cells on the slide?
A)No, the cells will have fragmented.
B)Yes, the cells will still be present but UV light will have damaged the DNA.





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