Which of the following describes a feature found in bacterial expression vectors but not in cloning vectors?
(a) origin of replication
(b) cleavage sites for restriction nucleases
(c) promoter DNA sequences
(d) a polyadenylation signal
Choice (c) is correct. Origins of replication [choice (a)] and cleavage sites for restriction nucleases [choice (b)] are found in both cloning vectors and expression vectors. Bacterial mRNAs do not undergo polyadenylation [choice (d)].
You might also like to view...
The most common form of ionizing radiation is ____________________. Fill in the blank(s) with the appropriate word(s)
Reverse transcriptase, the enzyme responsible for copying viral RNA into cDNA prior to integration into the host genome, lacks 3'-to-5' exonuclease "proofreading" ability. How is this advantageous to organisms that depend on such enzymes?
What will be an ideal response?
Warming wetland peat, melting permafrost, and vanishing arctic ice are all examples of ________________ related to climate change
A. eutrophication B. a negative feedback loop C. a positive feedback loop D. soil formation E. dynamic equilibrium
Which of the following phases of mitosis is not matched with the appropriate activities that occur during that phase?
A) anaphase: homologous pairs separate B) prophase: nuclear membrane disappears C) telophase: new nuclear envelope forms, and the mitotic spindle disassembles D) metaphase: chromosomes line up in the center of the cell