Bacteriophage ? inserts into a bacterial chromosome using which of the following?
A. Nucleotide excision repair
B. Endonuclease activity
C. Site-specific recombination
D. DNA gap repair
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A recombinant DNA was constructed by inserting the DNA of interest into the AmpR gene of a pBR322 vector. The vector also contains a TetR gene that is not interrupted
After introducing the recombinant DNA into bacterial cells, the resulting transformants were tested on a variety of media. Which of the following results would be expected? A. growth on both ampicillin containing media and tetracycline containing media B. growth on ampicillin but not tetracycline containing media C. growth on tetracycline but not ampicillin containing media D. no growth on either ampicillin or tetracycline containing media E. growth only on media containing both antibiotics
The human genome
A. has no foreign DNA because it is excised by DNase. B. has a very small amount of foreign DNA, mostly in the end caps (telomeres) of chromosomes. C. has a lot of foreign DNA, mostly in the end caps (telomeres) of chromosomes. D. has a lot of foreign DNA scattered throughout the genome, including transposons.
Colchicine is a drug that:a
arrests cells in mitotic telophase. b. stimulates meiosis. c. prevents DNA replication. d. arrests cells in mitotic metaphase. e. prevents cells from entering prophase
Abscisic acid (ABA) is synthesized in the roots in response to decreased soil water potential. ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells. What effect would this have on the stomata and the process of transpiration?
A. The change in the stomata would have no effect on the rate of transpiration. B. The stomata would close thereby increasing the rate of transpiration. C. The stomata would close thereby decreasing the rate of transpiration. D. The stomata would open thereby decreasing the rate of transpiration. E. The stomata would open thereby increasing the rate of transpiration.