Which of the following describes a dna mutation - apex

Hello. This question is incomplete. The complete question is:

"Which of the following describes a dna mutation - apex

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:

B. A change in the nucleotide sequence of a gene

Explanation:

One change in the base sequence in the gene's DNA molecule is called a DNA mutation or gene mutation. Albinism is an example of this type of mutation as it is caused by a DNA mutation that results in a change in the enzyme tyrosine that transforms the amino acid thyrazine into skin pigment, melanin. This disease occurs in animals and plants and is hereditary.

If the change in the base sequence in DNA does not affect the functioning of a molecule and does not harm the organism, the mutation generally goes unnoticed, is indifferent. Other times the change leads to a favor. Imagine, for example, that a certain cell in your gut starts producing an enzyme called cellulase that can digest the cellulose of the vegetables you eat. The mutation that led to this error is likely to be beneficial to you, which may even feed on shredded paper.