Notably Colostrinin decreased UVA and UVB radiation induced mutation frequency.
2.
Error rates are usually very low 1 error in every 10 100 million bases due to the " proofreading " ability of DNA polymerases . ( Without proofreading error rates are a thousandfold higher; because many viruses rely on DNA and RNA polymerases that lack proofreading ability, they experience higher mutation rates . ) Processes that increase the rate of changes in DNA are called mutagenic : mutagenic chemicals promote errors in DNA replication, often by interfering with the structure of base-pairing, while UV radiation induces mutations by causing damage to the DNA structure.
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