A Ti plasmid carrying a foreign gene is inserted into which bacterium that infects a plant cell?
A. Phytomyxea
B. Agrobacterium tumefaciens
C. Proteobacteria
D. Verticillium
E. Arabidopsis thaliana
Answer: B
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Which of the following antibodies is a dimer?
A. IgA B. IgD C. IgM D. IgE
Organisms that produce all of their offspring in a single event are
A. always successful. B. never successful. C. continuously iteroparous. D. semelparous. E. seasonally iteroparous.
Disturbances in sensory neurons will result in an
action potential if the a. potential is graded. b. potential change remains local. c. graded potential of threshold size reaches a trigger zone. d. localized potential changes do not spread too far. e. potential changes become downgraded to localized ones.
Bacterial cells are classified as prokaryotic cells. Where in bacteria cells is the DNA found?
A) ribosomes B) cell wall C) cytoplasm D) nucleus