The portal of entry for the largest number of pathogens is the _____
Fill in the blank(s) with the appropriate word(s).
respiratory tract
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You are part of a desert plant research team trying to discover crops that will be productive in arid climates. You discover a plant that, under water-deficit conditions, produces a hormone that triggers a suite of drought responses
Most likely the hormone is _____. A) abscisic acid B) gibberellin, or gibberellic acid C) indoleacetic acid D) 2, 4-D E) salicylic acid
You discover an organism that has a nucleus but no mitochondria. This organism could be a(n) ____
a. euglenoid b. diplomonad c. kinetoplastid d. ciliate e. dinoflagellate
An explanation of observations and data supported by the experimental results of many scientists for many years is
A) a theory. B) a hypothesis. C) scientific method. D) popular opinion. E) a control group.
All of the following may be targeted by TCÂ cells, except
A. invading bacterial cells. B. viral-infected host cells. C. cells in transplanted tissue from an imperfectly matched donor. D. cancer cells. E. All of these cells could be targeted by Tc cells.