OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Mistakes in replication or environmental substances
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The amino acids
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Passed down by genetics
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It’s how your born
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Detailed explanation-1: -Mutations result either from errors in DNA replication or from the damaging effects of mutagens, such as chemicals and radiation, which react with DNA and change the structures of individual nucleotides. All cells possess DNA-repair enzymes that attempt to minimize the number of mutations that occur (Section 14.2).
Detailed explanation-2: -Errors during DNA replication are not the only reason why mutations arise in DNA. Mutations can also occur because of damage to DNA. Mutations can result from an exposure to a mutagen: chemicals, UV rays, x-rays, or some other environmental agent.
Detailed explanation-3: -Mutations can result from errors in DNA replication during cell division, exposure to mutagens or a viral infection. Germline mutations (that occur in eggs and sperm) can be passed on to offspring, while somatic mutations (that occur in body cells) are not passed on.