Answers.RNA

DNA, RNA & Proteins
RNA Answers

    RNA Review Answers:

    1. B - Transcription occurs in the nucleus, because that is where the DNA is located. DNA is essential as a template for mRNA production during transcription. However, in prokaryotes, transcription occurs in the cytoplasm due to the lack of a nucleus.

     2. D - Uracil is a pyrmidine base found in RNA. Its DNA counterpart is Thymine.

     3. C - AUG is the proper anticodon sequence in the tRNA. AUG is complementary to the UAC mRNA codon.

     4. C - Mature mRNA is protected from destruction by enzymes. However, RNases attack and destroy RNA. Proteases attack and destroy proteins. Therefore, mRNA does not need protection from proteases.

     5. B - Codons are used to determine the amino acid sequence. Codons, however, are composed of mRNA, not DNA, nucleotides.

     6. A - Frameshift mutations do not always cause incorrect amino acids to be added to the growing polypeptide. Sometimes, even if the third base is changed, the amino acid is the same. This is known as the "Wobble Hypothesis."

     7. D - All three types of RNA are single-stranded; whereas, DNA is double-stranded.

     8. B - tRNA is the only RNA that contains anticodons. This is the segment of three nucleotides which are complementary to the mRNA codon.

     9. A - mRNA is produced from DNA during transcription in the nucleus of eukaryotes and the cytoplasm of prokaryotes.

     10. E - None of the three types of RNA contain Thymine. It is only found in DNA. Uracil is the RNA counterpart.

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