The Impact of DNA Mutations on Genes and Proteins

The video explains mutations as changes in the DNA sequence, often occurring during cell division. It discusses factors increasing mutation risk, such as carcinogens and radiation. The video covers how mutations can alter protein formation, potentially affecting their function. It also describes three mutation types: substitution, insertion, and deletion, highlighting their impact on DNA sequences and protein synthesis.

What is a mutation in the context of DNA?

• A change in the cell membrane

• A change in the DNA base sequence

• A change in the protein structure

• A change in the RNA sequence

Which of the following can increase the risk of mutations?

• Vitamins

• Carcinogens and certain types of radiation

• Balanced diet

• Exercise

What is a gene in terms of DNA?

• A section of DNA that codes for a protein

• A section of RNA that codes for a lipid

• A section of DNA that codes for a carbohydrate

• A section of RNA that codes for a protein

How can a mutation affect a protein?

• It can double the protein's size

• It can make the protein disappear

• It can make the protein glow

• It can change the protein's shape or function

What is non-coding DNA?

• DNA that codes for proteins

• DNA that does not code for proteins

• DNA that codes for carbohydrates

• DNA that codes for lipids

What role does non-coding DNA play in gene expression?

• It determines the color of the cell

• It plays a role in turning genes on or off

• It codes for enzymes

• It determines the size of the cell

What is a substitution mutation?

• A base is added to the sequence

• A base is duplicated in the sequence

• A base is removed from the sequence

• A base is replaced by another base

How does an insertion mutation affect the DNA sequence?

• It changes a base to another base

• It duplicates a base in the sequence

• It adds an extra base, shifting the sequence

• It removes a base from the sequence

What happens in a deletion mutation?

• A base is removed, shifting the sequence

• A base is duplicated in the sequence

• A base is added to the sequence

• A base is replaced by another base

Which type of mutation is generally more disruptive to the DNA sequence?

• Duplication

• Insertion

• Substitution

• Translocation