GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ribozymes(enzymes that work only on RNA) may function in RNA splicing.
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Exons are cut out before mRNA leaves the nucleus.
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RNA splicing can be catalyzed by spliceosomes.
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Nucleotides may be added at both ends of the RNA.
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Detailed explanation-1: -The statement “Exons are cut out before mRNA leaves the nucleus” is true. The statement “Nucleotides may be added at both ends of the RNA” is false.
Detailed explanation-2: -Exons are cut out before mRNA leaves the nucleus. Ribozymes may function in RNA splicing. RNA splicing can be catalyzed by spliceosomes. A primary transcript is often much longer than the final RNA molecule that leaves the nucleus.
Detailed explanation-3: -Which of the following is not part of RNA processing in eukaryotes? Reverse transcription is the enzymatic synthesis of DNA from an RNA template by the enzyme reverse transcriptase. This enzyme is not involved in the RNA processing reactions.
Detailed explanation-4: -Which of the following is NOT the step of mRNA processing? Explanation: mRNA processing occurs only in eukaryotes, it involves 5’capping, slicing of introns, polyadenylation, and RNA editing before transported to the cytoplasm, where they are translated to the ribosome.