In Petunias, immature styles express a high level of RNase (a nuclease that catalyzes the degradation of RNA). What type of SI would this affect, and how?
A. It will stop gametophytic SI.
B. It will have no effect.
C. It will enhance gametophytic SI.
D. It will enhance sporophytic SI.
E. It will stop sporophytic SI.
Answer: C
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Which of the following are not part of plant defense systems for pathogens?
A. Protein receptors detect a broad class of molecules produced by many pathogens and mount defense mechanisms. B. R proteins inside the plant cells recognize AVR proteins on pathogens. C. Plants reinforce barriers, such as by closing stomata and reinforcing cell walls. D. Cells surrounding the infection site produce reactive oxygen species. E. Plants produce AVR proteins when invaded by a pathogen.
Dark chocolate and tomatoes contain antioxidants that have been unequivocally shown to improve health.
a. true b. false
African sleeping sickness is caused by
A. Trypanosoma brucei. B. Trypanosoma cruzi. C. Isospora belli. D. Plasmodium falciparum. E. Leishmania brasiliensis.
The pre-digestive organ listed above “C” is called
the a. mouth. b. crop. c. gizzard. d. secreting portion of stomach. e. cloaca.