Podcast
Questions and Answers
Which of the following is NOT a cause of gene mutations?
Which of the following is NOT a cause of gene mutations?
- Radiation
- Sunlight
- Healthy diet (correct)
- Smoking
What is the term used to describe permanent changes in a DNA sequence?
What is the term used to describe permanent changes in a DNA sequence?
- Gene mutations (correct)
- Point mutations
- Silent mutations
- Missense mutations
Which type of mutation occurs when only one base in DNA is altered, producing a change in a single base of an mRNA codon?
Which type of mutation occurs when only one base in DNA is altered, producing a change in a single base of an mRNA codon?
- Silent mutations
- Nonsense mutations
- Insertions and deletions
- Point mutations (correct)
Which type of point mutation does not affect the amino acid sequence of the protein?
Which type of point mutation does not affect the amino acid sequence of the protein?
What happens in a missense mutation?
What happens in a missense mutation?
Which of the following is an example of an exogenous factor that can cause mutations?
Which of the following is an example of an exogenous factor that can cause mutations?
What type of mutation occurs when one base in DNA is altered, producing a change in a single base of an mRNA codon?
What type of mutation occurs when one base in DNA is altered, producing a change in a single base of an mRNA codon?
Which type of point mutation does not affect the amino acid sequence of the protein?
Which type of point mutation does not affect the amino acid sequence of the protein?
What happens in a missense mutation?
What happens in a missense mutation?
What are the causes of mutations?
What are the causes of mutations?
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Study Notes
Gene Mutations
- Gene mutations result from various factors, including environmental influences and internal cellular processes.
- Permanent changes in a DNA sequence are known as mutations.
Types of Mutations
- A point mutation involves the alteration of a single base in the DNA sequence, leading to changes in the corresponding mRNA codon.
- Silent mutations are a type of point mutation that do not alter the amino acid sequence of the resultant protein.
Missense Mutation
- A missense mutation results in the substitution of one amino acid for another in a protein, potentially impacting its function.
Causes of Mutations
- Mutations can arise from exogenous factors, such as radiation, chemicals, or infectious agents, which can induce changes in the DNA structure.
- Endogenous factors, including errors during DNA replication or repair, can also lead to mutations.
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