How does a deletion mutation differ from a substance mutation?

Answer;

A deletion mutation completely destroys a nucleotide, but substitution mutation replaces a nucleotide, or one amino acid.

Explanation;Deletion is an example of a Frame shift mutation, a mutation that shift the reading frame of the genetic message by inserting or deleting a nucleotide.A deletion mutation occurs when part of a DNA molecule is not copied during DNA replication. Deletion of a nucleotide in a DNA sequence that causes a frame shift mutation which usually produces a malfunctioning protein.Substitution Mutation occurs when one nucleotide base is replaced by another. There are three types of substitution mutation namely; Missense, Nonsense, and Silent mutations.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.