item 7 although 61 different codons code for amino acids, cells contain fewer than 61 different trnas. why?

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10-11-2022
Biology

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item 7 although 61 different codons code for amino acids, cells contain fewer than 61 different trnas. why?

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contexto1005 contexto1005 · Answer 1 · 2022-11-16T06:53:20-05:00

One reason for this is that some amino acids are encoded by multiple codons. For example, the amino acid glycine can be encoded by four different codons: GGU, GGC, GGA, and GGG. So, even though there are 61 codons, there are only 20 amino acids that they can encode for.

Another reason is that not all codons are used equally. Some codons are used much more frequently than others. For example, the codon UUU codes for the amino acid phenylalanine, but this codon is used much less frequently than the codon UUA, which also codes for phenylalanine. So, even though there are 61 codons, the number of different tRNAs that are needed is much smaller.

There are numerous reasons why cells might contain fewer than 61 different tRNAs. One possibility is that some amino acids are encoded by multiple codons, so a single tRNA can recognize and attach to multiple codons. Another possibility is that some tRNAs are promiscuous, meaning they can recognize and attach to multiple codons. Finally, it's also possible that some codons are simply not used by cells, so there is no need for a tRNA to recognize and attach to them.

Learn more about tRNA at : https://brainly.com/question/21312423

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