Students will participate in laboratory-based practical sessions in which will be performed in interactive group settings with summative practical laboratory reports and/or the lab manual will be submitted/reviewed during the module for grading. Having an RNA intermediate allows the information in DNA to travel from the nucleus to the cytoplasm.Practical lab sessions will be completed to allow students to become familiarised with the use of pipettes, the accurate preparation of solutions, the idenfication of key cellular structures in the cell and the use of recombinant DNA technology in the lab.Ī multiple choice / short answer / sketch / fillĪ multiple choice / short answer / sketch / fill in the blanks exam will be performed to examine the knowledge and understanding the students have gained from weeks 1-3. In addition, in eukaryotes DNA is kept in the nucleus, while translation happens on ribosomes (found in the cytoplasm). This allows cells to be much more responsive to changing conditions. There are also multiple levels of regulation that can control how much mRNA is present, what parts of the mRNA get kept‡, and how frequently the mRNAs get translated. This is because many mRNAs can be transcribed from a gene and then each mRNA can be translated independently (and multiple times). Making mRNA also allows efficient production of proteins from a single gene. (You'd have to redesign life from scratch!) This means that we use RNA because "life" has always used RNA and getting rid of it by evolutionary processes would be essentially impossible. One strongly supported hypothesis is that RNA actually came first - this known as the "RNA world hypothesis"§. This is an interesting question to think about, but "why" questions in biology are often very difficult to answer in a meaningful way.īelow I've listed one possible evolutionary reason for the use of mRNA as an intermediary and then some advantages to this system.
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