Which of the following is not true of cloning vectors?
A. They can be replicated within an appropriate host.
B. They contain at least two replication origins.
C. They usually contain multicloning sites or polylinkers.
D. All of these choices are correct.
Answer: B
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During endocytosis, if a bacterial cell is not degraded and bacterial DNA is taken up by the eukaryotic cell, what may have occurred?
A. vertical evolution. B. horizontal gene transfer. C. vertical exon shuffling. D. chromosomal duplication and genomic exchange. E. both chromosomal duplication and vertical evolution.
The number of electrons for the atom depicted in the figure is
a. 5. b. 7. c. 8. d. 15. e. 22.
A prolonged, relatively mild period with ample precipitation alternates with a cold period when plants become dormant
(A) deciduous forest (B) Tropical rain forest (C) Desert (D) Tundra (E) Taiga
A human gene is composed of numerous fragments of protein-encoding information known as ________.
A. DNA B. exons C. introns D. mRNA