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Bio Chapter 15 Quiz

QuestionAnswer
The AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains this? complementarity nonsense codons universality degeneracy degeneracy
How many nucleotides are in 12 mRNA codons? 12 24 36 48 36
Which subunit of the E. coli polymerase confers specificity to transcription? a B B" o o
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 same function in all organisms they are similar in all bacterial species
Which feature of promoters can be found in both prokaryotes and eukaryotes? GC box TATA box octamer box -10 and -35 sequences TATA box
What transcripts will be most affected by low levels of a-amanitin? 18S and 28S rRNAs pre-mRNAs 5S rRNAs and tRNAs other small nuclear RNAs pre-mRNAs
Which pre-mRNA processing step is important for initiating translation? poly-A tail RNA editing splicing 7-methylguanosine cap 7-methylguanosine cap
What processing step enhances the stability of pre-tRNAs and pre-rRNAs? methylation nucleotide modification cleavage splicing methylation
The RNA components of ribosomes are synthesized in the ____. cytoplasm nucleus nucleolus endoplasmic reticulum nucleolus
In any given species, there are at least how many types of aminoacyl tRNA synthetases? 20 40 100 200 20
Created by: mortehay000
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