Question

Exam Practice Questions: L09-11 1. Fill in each blank with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once. promoter translation pause site RBS sigma factor tmRNA RNA polymerase stop codon transcription Rho factor ribosome start codon DNA polymerase attenuation tRNA The first step in gene expression is by to make an mRNA that encodes for one or more proteins. This requires that a binds to the DNA at the sequence upstream of the open-reading-frame. A protein is then made by of an mRNA by the . Termination of transcription requires a while termination of translation requires a An antisense sRNA can inhibit translation initiation through complementary base-pairing to the sequence in its target mRNA. Transcription of the trp operon is repressed when tryptophan levels are abundant and the cell is able to make charged _s with this amino acid. Ribosomes that are stalled on an mRNA that lacks a stop codon are rescued by a that encodes a tag that targets the protein for degradation followed by a stop codon.

Answer 1

1)transcription 2)Rna polymerase 3)sigma factor 4)promoter 5) rbs 6)translation 7)rho factor 8) stop codon 9) pause site10)tRNA 11)tmRNA