Which wavelengths of UV light are MOST detrimental to bacterial cells? UV-C UV-B None of them are detrimental to bacterial cells, only eukaryotic cells UV-A
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UV light with wavelength between 290 and 400 nm is the most effective in controlling bacterial growth. When placing the bacteria plates under the UV light, the cards covering half of the plates should be removed, along with your gloves, the lids of the agar plates, and your eye protection. UV light causes damage to the DNA in bacteria, preventing replication and transcription, and resulting in cell death. False.
Adi S.
Gamma radiation and x-radiation provide ionizing forms of radiation. What effect does ionizing radiation have on molecules through which they pass? It causes an excitation and subsequent loss of electrons in any type of molecule. It produces free radicals, which are highly toxic to the cell. Ionizing radiation is able to cause a loss of electrons, a breakdown of water molecules, and the production of damaging free radicals. It breaks down water molecules into highly reactive hydrogen and hydroxide ions. Which type of electromagnetic radiation is most commonly used to kill bacterial cells? X-rays Ultraviolet light Gamma rays Infrared light Which of the following statements best describes the effects of thymine dimerization induced by ultraviolet light? Covalent bonding of two adjacent thymine molecules on one nucleic acid strand in the DNA molecule Covalent bonding of two adjacent lipid molecules in the cell wall of the bacterial cell Covalent bonding of two adjacent amino acids in a protein molecule Covalent bonding of two bacterial cells together What safety precaution must be followed when using ultraviolet light in order to prevent injury? You should never look directly at a source of ultraviolet light. You must wear a lab coat to protect yourself from ultraviolet light. You should keep the bacterial cultures away from ultraviolet light sources. You must only use ultraviolet light in the absence of other light sources.
In the experiment on UV radiation and microbial growth, indicate which of the organisms tested was harmed the most after UV exposure? Explain why this may have been the case.
Sri K.
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