24) Now is protesin made fom mRNA? What mportant for transiation rihosome om mAN

Question

24) Now is protesin made fom mRNA? What mportant for transiation rihosome om mANAP What aw materiah must be esent e the that ibsomes contain three stes fer IRNA and not bust one? r? Why i 15) Why can transcription and translation be simultaneous in prokaryotes but not in eukaryotex? 3 e w is a eukaryotic primary transcript different from finished MRNA? What about a prokaryotic grmary transcript(4 points) 17) What tells the ribosome where to start translation and stop translation? (2 points) 18) All of the following are directly involved in translation except.. (1 poin a. mRNA b. tRNA C. DNA d. ribosomes e. all of the above are involved

Explanation / Answer

15. Prokaryotic mRna lacks introns and they don't undergo post transcriptional modification hence transcription and translation takes place simultaneously. While eukaryotic mRNA has both introns and exons so transcription and translation separately.

16. Eukaryotic primary transcript is known as pre-mRNA. They have both introns and exons. Pre-mRNA undergo post transcriptional modification such as splicing, 5'cap and poly A tail to obtain the finished mRNA. Finished mRna has only exons. While prokaryotic mRna lacks introns and they don't undergo post transcriptional modification.

17. Start codon - AUG and Stop codon - UAA, UAG, UGA determines the start and stop of translation.

18. Answer: Option C. Explanation: DNA is not directly involved in translation. It is the mRNA (which obtains genetic information from DNA to code for a protein) is directly involved in translation.

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