A variant of the icosahedral shape found in some bacteriophages is called:
a. Complex
b. Helical
c. Prolate
d. Nucleic
e. Enveloped
Ans: c. Prolate
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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 hormones secreted by the anterior pituitary are ____
a. peptide hormones b. neurotransmitters c. steroid hormones d. second messengers e. polar
The gene frequencies of a population can be expected to change if
A. the population is small. B. no mutation occurs. C. no migration occurs into or out of the population. D. random mating occurs.
The pH of the adult vagina is acidic due to the conversion of ________ to ________ by bacteria
A) glucose; ethanol B) protein; acetic acid C) glycogen; lactic acid D) mucosal cells; lactic acid E) urine; lactic acid