A specific component that is required to terminate transcription in E. coli is

A specific component that is required to terminate transcription in E. coli is
A.  sigma factor.
B.  lambda factor.
C.  rho factor.
D.  stop codon.
E.  none of the above.


Which three amino acids are all known to undergo posttranslational modifications?
A.  glutamine, valine, isoleucine
B.  tyrosine, lysine, alanine
C.  proline, glutamic acid, serine
D.  aspartic acid, histidine, glycine
E.  methionine, threonine, phenylalanine


Peptide bonds are formed during protein synthesis between
A.  the carboxyl group on peptidyl-tRNA and the amino group on aminoacyl-tRNA.
B.  the carboxyl group on aminoacyl-tRNA and the amino group on peptidyl-tRNA.
C.  the carboxyl group on a free amino acid and the amino group on aminoacyl-tRNA.
D.  the carboxyl group on aminoacyl-tRNA and the carboxyl group on a free amino acid.
E.  the carboxyl group on a free amino acid and the amino group on a free amino acid.