The AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains this?
- nonsense codons
How many nucleotides are in 12 mRNA codons?
Which subunit of the E. coli polymerase confers specificity to transcription?
The -10 and -35 regions of prokaryotic promoters are called consensus sequences because ________.
- they are identical in all bacterial species
- they are similar in all bacterial species
- they exist in all organisms
- they have the same function in all organisms
Which feature of promoters can be found in both prokaryotes and eukaryotes?
- GC box
- TATA box
- octamer box
- -10 and -35 sequences
What transcripts will be most affected by low levels of α-amanitin?
- 18S and 28S rRNAs
- 5S rRNAs and tRNAs
- other small nuclear RNAs
Which pre-mRNA processing step is important for initiating translation?
- poly-A tail
- RNA editing
- 7-methylguanosine cap
What processing step enhances the stability of pre-tRNAs and pre-rRNAs?
- nucleotide modification
The RNA components of ribosomes are synthesized in the ________.
- endoplasmic reticulum
In any given species, there are at least how many types of aminoacyl tRNA synthetases?