Bacterial gene transfer is also used in the lab to introduce genes into organisms of different species, genera, phyla, or even kingdoms or domains
A major example is the use of a Ti plasmid of the soil bacterium Agrobacterium tumefaciens to transfer genes into dicotyledonous plants. The bacterium infects the plant root in the soil and transfers some of the Ti plasmid genes (T DNA) into the plant nucleus. Recombination may occur, and T DNA expression is controlled by plant compounds generated in response to wounding and infection. Assuming you have appropriately engineered the Ti plasmid to carry the gene in question, how could you best and most safely test whether your potatoes are now working as a vaccine? A) Feed the engineered potato to a population at high risk for cholera.
B) Cook the potatoes to denature the toxin and feed them to mice susceptible to cholera.
C) Feed pieces of raw potato to susceptible mice and test them for antibodies.
D) Emulsify the potatoes in a liquid that can be injected into experimental animals.
C
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Which of the following statements best describes the condition of fungal spores?
A. Sexual and asexual spores are both haploid. B. Sexual and asexual spores are both diploid. C. Sexual spores are haploid and asexual spores are diploid. D. Sexual spores are diploid and asexual spores are haploid. E. Haploid asexual spores fuse to form diploid sexual spores.
How did prions get from sheep to cattle?
a. Cattle were fed sheep parts as nutrient supplements. b. From humans infected with BSE. c. From humans infected with vCJD. d. From keeping sheep and cows in the same herd. e. Through a virus.
In angiosperms, the _______________ are the specialized reproductive organ(s) whose main function is to bring together the sperm and egg.
a. flowers b. seeds c. cones d. pollen grains e. leaves
A structured procedure for collecting information to test a hypothesis is a(n)
A. principle B. theory C. control D. experiment