Start codons is necessary for the start of protein at accurate site on mRNA sequence, while stop codon is necessary for termination of protein synthesis. if any of them either start or stop codon attach at inappropriate place in mRNA sequence it will lead to abnormal protein synthesis.<span />
True.
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That is true and cacti with many spines are typically preferred by parasites. This is an example of bidirectional selection in which evolutionary pressures from multiple sources encourage an organism to adapt.