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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 correct

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 correct

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Solution

The correct answer is B. 1 and 3.

Here's why:

  1. snRNA: This stands for small nuclear RNA. It is not translated into protein, but it is transcribed from the 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), not DNA. So, they would still exist even if only sequences of DNA that code for proteins were transcribed.

  3. tRNA: This stands for transfer RNA. Like snRNA, it is not translated into protein, but it is transcribed from the DNA. So, it would not exist if only sequences of DNA that code for proteins were transcribed.

  4. mRNA: This stands for messenger RNA. It is the product of transcription of DNA that codes for proteins. So, it would still exist even if only sequences of DNA that code for proteins were transcribed.

This problem has been solved

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