Which of the following is nottrue of the first step of translational elongation in bacteria?
A. GTP-bound EF-Tu interacts with the tRNA acylated with the next amino acid to be added.
B. The function of EF-Ts is to exchange the GDP bound by EF-Tu with GTP.
C. EF-Tu hydrolyzes GTP after dissociation from the aminoacyl-tRNA bound in the A site.
D. Correct codon-anticodon interactions are proofread when the EF-Tu dissociates through a process called accommodation.
Describe a method used to visualize the location of a protein in a cell.
What will be an ideal response?
What is the correct order of transcriptional events occurring after RNA polymerase binds to the promoter?
A. start of RNA synthesis, open complex formation, closed complex formation, promoter clearance
B. closed complex formation, open complex formation, promoter clearance, start of RNA synthesis
C. closed complex formation, open complex formation, start of RNA synthesis, promoter clearance
D. open complex formation, closed complex formation, start of RNA synthesis, promoter clearance
E. open complex formation, closed complex formation, promoter clearance, start of RNA synthesis
Which of the following best describes the translational elongation process?
A. tRNA molecules condense with rRNA molecules.
B. Ribonucleotides are added to amino acids through the synthesis of phosphodiester bonds.
C. The polypeptide chain is lengthened by synthesizing peptide bonds between amino acids.
D. Ribosomal proteins aggregate to form polysomes.
Which of the following is true of supercoiling?
A. The relaxed form of DNA is more stable and is therefore the preferred form in the cell.
B. Most organisms maintain their DNA in a slightly overwound state in order to enhance strand separation during transcription and replication.
C. Overwound DNA is in the B form so relaxed DNA has less turns than B-form DNA.
D. Most organisms maintain their DNA in a slightly underwound state in order to compact their DNA.
E. The relaxed form of DNA can only be maintained if the DNA is a closed circle.
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