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Hello students, i'll be answering three questions in this video.
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To begin with the first one, for a natural selection to act on a new gene, the gene must be able to change the phenotype of the organism because for the natural selection to act on a new gene, the gene must produce a new phenotype that affects the organism's fitness.
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If the gene has no effect on the phenotype, natural selection cannot act on it.
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The correct answer to this question is option a.
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In the next question, we need to select an option which makes the bacterial cell wall unique when compared to the cell wall of archaea and eukaryotes.
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That one molecule which makes the bacterial cell wall unique is option d, peptidoglycan layer.
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Bacterial cell wall is composed of peptidoglycan, which is a complex molecule consisting of sugars and amino acids.
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In contrast, eukaryotic cell walls are made up of various polysaccharides and proteins, while archial cell walls contain a range of molecules including pseudo -peptidoglycan...