Compare and contrast operon and protein fusions
What will be an ideal response?
Answer: Operon and protein fusions are both examples of gene fusions that bring together two separate nucleotide sequences. A gene fusion is formed when one of the genes' promoter regions is fused to the coding region of the other gene upstream of it. Protein fusions have transcription occur at the same site for the two fused genes, and translation of the fused transcript takes place at one site. An operon fusion retains separate translational start sites despite sharing the same transcriptional start site.
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Which of the following is not a step in bacterial nucleotide excision repair (NER)?
A. The UvrA2UvrB complex creates a single-stranded bubble at the damage site to which UvrA subunits are tightly bound and the UvrB subunit dissociates. B. The UvrA2UvrB complex scanned the DNA for damage. C. Pol I fills the gap created by the removal of the damaged strand and the DNA is sealed by ligase. D. UvrC (exinuclease) nicks the damaged strand on one side of the damage randomly. E. UvrD (helicase) unwinds and releases the damaged strand.
An important role of bacteria is:
a. primary producers. b. decomposers. c. nitrogen fixation. d. all of the above
Normal white blood cells (called B cells) and cancerous B cells that cause leukemia both carry a unique surface protein
called CD-19. a. True b. False
Which of the following is the most complex level of organization?
A. columnar epithelium B. cardiovascular system C. heart D. brain E. lungs