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)].

Biology & Microbiology

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The most common form of ionizing radiation is ____________________. Fill in the blank(s) with the appropriate word(s)

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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?

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology