Crown gall disease in plants comes from exposure to the soil bacterium Agrobacterium tumefaciens. How is it that the tumors characteristic of the disease can persist when the bacteria are no longer found in the plant?
What will be an ideal response?
Ans: The disease-causing ability is actually carried by the Ti ("tumor inducing") plasmid, which is transferred from bacterial cells into plant cells and remains to perpetuate tumors.
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a. foraminiferans b. brown algae c. dinoflagellates d. red algae e. green algae
The five distinctly different tastes that stimulate receptors on the human tongue are ________, ________, ________, ________, and ________
Fill in the blank(s) with correct word
An individual who has been bitten by a poisonous snake that has a fast-acting toxin would likely benefit from _____
A) vaccination with a weakened form of the toxin B) injection of antibodies to the toxin C) injection of interleukin-1 D) injection of interferon
What unit of measure is most appropriate for expressing the size of bacteria?
A. nanometer B. picometer C. milimeter D. micrometer