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You may have left high school thinking that the definition of a gene is: "a sequence of DNA that codesfor a protein.”If that was in fact the only sequence of DNA that was transcribed, which of the following would notexist?1. snRNA2. ribosomes3. tRNA4. mRNAA. 1, 2 and 3B. 1 and 3C. 2 and 4D. 4 onlyE. All of 1, 2, 3 and 4 are correc

Question

You may have left high school thinking that the definition of a gene is: "a sequence of DNA that codesfor a protein.”If that was in fact the only sequence of DNA that was transcribed, which of the following would notexist?1. snRNA2. ribosomes3. tRNA4. mRNAA. 1, 2 and 3B. 1 and 3C. 2 and 4D. 4 onlyE. All of 1, 2, 3 and 4 are correc

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Solution

The correct answer is B. 1 and 3.

Here's why:

  1. snRNA (small nuclear RNA) - This is a type of non-coding RNA. It is not translated into a protein, but it is transcribed from DNA. So, if only sequences of DNA that code for proteins were transcribed, snRNA would not exist.

  2. Ribosomes - These are made up of proteins and rRNA (ribosomal RNA). The rRNA is transcribed from DNA, but it is not translated into a protein. However, the proteins that make up part of the ribosome are coded for by DNA. So, ribosomes would still exist even if only sequences of DNA that code for proteins were transcribed.

  3. tRNA (transfer RNA) - This is another type of non-coding RNA. It is trans

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