Indicate Whether Each of the Following Statements Is True (T)or
Indicate whether each of the following statements is true (T)or false (F).
___ Bacterial mRNA is broken down within a few minutes of its formation in E.coli.
___ Bacterial mRNA consists only of the bases that code for amino acids.
___ Polysomes do not necessarily contain mRNA.
___ Bacterial mRNA normally occurs as a double-stranded structure,with one strand containing codons,the other containing anticodons.
___ Bacterial mRNA can be translated while it is still being synthesized.
Regarding translation in eukaryotes versus that in prokaryotes (bacteria),indicate whether each of the following statements is true (T)or false (F).
___ In eukaryotes,the 3' end of the mRNA is associated with the 5' end during initiation,whereas in prokaryotes,it is not.
___ In prokaryotes,it is initiated at an AUG near a Shine-Dalgarno sequence in the mRNA,whereas in eukaryotes,it is initiated at an AUG near the 3' end of the mRNA.
___ In prokaryotes,it is initiated with Met,whereas in eukaryotes,it is initiated with fMet.
___ In prokaryotes,translation and transcription are coupled,whereas in eukaryotes,they are not.
Polypeptide chain elongation in E.coli occurs by the cyclical repetition of three steps.What are these steps and what cellular components are necessary for each of them to occur?
The ribosome does not have a comparable protease proofreading function like the exonuclease activity found in DNA polymerase.What is the "technical difficulty" that perhaps prevented the easy evolution of such an activity?