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ehidna [41]
3 years ago
10

How does the immune system know if a foreign particle has infected the body?

Biology
1 answer:
xeze [42]3 years ago
8 0
The cells won't recognize the foreign particle <span />
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Explain how comparing amino acid sequences can provide information about evolutionary relationships.
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How do amino acid sequences provide information about evolutionary relationships among organisms? They allow scientists to compare the order of the acids in a protein to see how closely related the organisms are.

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Mutation is a change; whether small or big, in the nucleotide sequence of the genome of an organism. It can occur as a result of mistakes during replication or copying of genetic material or can be induced by mutagens (mutation-causing components).

Most mutations that occur in the genome of organisms usually have no effect on the phenotypic expression of that organism. This is so because mutations can be silent in the sense that although it changes the nucleotide sequence but it does not change the amino acid sequence of a protein.

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In the case of beneficial mutation, the produced protein can confer the ability to adapt better to an environment on the organism. A vivid example is the mutation that occurs in bacteria, which makes it gain resistance to certain antibiotics. This mutation is beneficial to the bacterial organism.

On the other hand, the different protein produced may not be functional and hence lead to deficiency in the organism's functioning. An example is the mutation that causes deficiency of insulin protein in humans. This kind of mutation is said to be deleterious or harmful.

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