Question

Which of the following describes a DNA mutation? A. The linking of free nucleotides into a long chain B. A change in the nucleotide sequence of a gene C. The packaging of DNA into a structure called a chromosome D. The substitution of uracil for thymine in RNA

Answer 1

B. A change in the nucleotide sequence of a gene.

Step-by-step explanation:

A DNA mutation refers to any alteration or change in the nucleotide sequence of a gene. This change can involve various types of modifications, such as substitutions, insertions, or deletions of nucleotides. Mutations can occur spontaneously or be induced by external factors like radiation or certain chemicals. These changes in the DNA sequence can impact the structure, function, or expression of the gene, potentially leading to phenotypic variations or genetic disorders.

Answer 2

Answer: The correct answer is -

B. A change in the nucleotide sequence of a gene.

Mutation can be described as permanent change in the genetic material of living organisms (that is DNA, deoxyribonucleic acid).

In other words, it depicts change in the sequence of nucleotide within gene (a segment of DNA that codes for particular protein).

It can be caused due to error in the replication process or by the exposure to some chemical, physical or biological agents (that are known as mutagens, such as UV radiation).

Mutation can result in altered protein, if change is within the coding region.

There are primarily three types of mutation, which are substitution, insertion, and deletion mutation.

Thus, option B) is the right answer.