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.
A. The carbenicillin ensures that the cells contain a Ti plasmid and the kanamycin ensures that the cells have a recombinant Ti plasmid.
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The organization of the vasa recta around the loop of Henle:
A. allows urea to be concentrated in the distal convoluted tubule. B. allows water to be maximally reabsorbed from the distal convoluted tubule. C. allows the concentration gradient established by the loop of Henle to be maintained. D. allows urea to be concentrated in the distal convoluted tubule and allows the concentration gradient established by the loop of Henle to be maintained. E. allows water to be maximally reabsorbed from the distal convoluted tubule and allows the concentration gradient established by the loop of Henle to be maintained.
In pre-mRNA processing, ____
a. exons are spliced out and used to produce ribosomal subunits b. introns are spliced out and combined to form complete proteins c. introns are spliced out and combined in the tRNA d. exons are spliced out and the introns are combined in the mature mRNA e. introns are spliced out and the exons are combined in the mature mRNA
The earliest hominin fossils are found in
a. Africa. b. Asia. c. Australia. d. the South Pacific. e. Europe.
Which mutated gene is inherited in cases of cystic fibrosis?
a. BRCA-1 b. BRCA-2 c. aPOE-4 d. aPOE-2 e. CFTR