Answer: A mutagen is a chemical compound or form of radiation that causes mutations, which of course means a change in the dna of a cell. So, your answer would be C) an environmental agent that changes DNA.
The answer is the eardrum. The eardrum is connected to 3 ossicles, the hammer, the anvil, and the stirrup or malleus. It is the part of the ear that vibrates first when sound waves enter the ear.
The +1 site is the transcription start site and the region 10 base pairs upstream is a region of the promoter critical for sigma binding and initiation. Initiation will be inhibited because sigma cannot bind to the promoter. Mutations are random, sudden spontaneous changes that occur in the genetic make up of an organism.
<span>Light microscopes can only produce clear images of objects to a magnification of</span> about 1000 times