Bacteria use ______ attached TO the polymerase to direct RNA polymerase to promoters; eukaryotic cells use ______ that attach directly to the DNA first instead.
A. sigma factors; transcription factors
B. transcription factors; sigma factors
C. ribosomes; sigma factors
D. tRNA; rRNA
In DNA sequence analysis
A. the + strand of DNA is used.
B. the start codon is ATG.
C. ORFs are searched for.
D. codon usage is a helpful indicator for protein coding areas.
E. All of the choices are correct.
Some segments of the precursor mRNA in eukaryotes are non-coding and are called
A. exons.
B. introns.
C. integrans.
D. uselessans.
The ribosomes
A. move along the tRNA in a 3'-5' direction.
B. move along the mRNA in a 5'-3' direction.
C. move along the DNA in a 5'-3' direction.
D.
provide a platform that brings the amino acids into a favorable position for joining.
E.
move along the mRNA in a 5'-3' direction AND provide a platform that brings the amino acids into a favorable position for joining.
A stop codon
A. codes for the stop amino acid s-methyl-methionine.
B. forms a hairpin loop forcing the ribosome to fall off.
C. codes for no amino acid.
D. enhances the binding of the e-polymerase.
E. codes for the stop amino acid s-methyl-methionine AND forms a hairpin loop forcing the ribosome to fall off.
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