Constriction where sister chromatids of a chromosome are held together.
What will be an ideal response?
centromere
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You wish to express gene X in soybeans. You clone gene X into a Ti plasmid (shown below), transform the recombinant plasmid into Agrobacterium tumefaciens, treat soybean cells with the transformed A. tumefaciens, and place the cells on medium containing the antibiotics kanamycin and carbenicillin. What is the purpose of these two antibiotics?
A. The carbenicillin ensures that the cells contain a Ti plasmid and the kanamycin ensures that the cells have a recombinant Ti plasmid.
B. The carbenicillin and kanamycin both ensure that the cells picked up recombinant T DNA.
C. The kanamycin ensures that the cells contain recombinant T-DNA and the carbenicillin kills the A. tumefaciens.
D. The carbenicillin ensures that the cells contain recombinant T-DNA and the kanamycin kills the A. tumefaciens.
E. The carbenicillin and kanamycin both kill the A. tumefaciens.
The tracheae of adult terrestrial insects have been a factor in the great abundance of insects because they serve the same function in terms of the delivery of respiratory gases to the cells as do
A. the gills of aquatic insects. B. the lungs of mammals. C. the book lungs of spiders. D. the closed circulatory system of cephalopods. E. the Malpighian tubules of spiders.
What would happen if you injected a calcium-channel blocking chemical into a muscle cell?
A. It would be unable to communicate with nerves. B. It would be unable to contract. C. It would relax more slowly. D. It would die. E. It would divide.
Understanding the risks in participating in a clinical trial and agreeing to participate is known as ________
A) the placebo effect B) the drug affect C) informed consent D) drug-drug interaction E) a double-blind study