The bacterium Clostridium (botulinum/difficile/perfringens) is an opportunistic pathogen that can cause a severe, potentially fatal diarrhea.
Fill in the blank(s) with the appropriate word(s).
difficile
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Your botany teacher is making assignments for a research project on a plant species. She assigns you to study hemlock (Conium maculatum) and mentions that is an r-selected species. Based on this, what characteristics would you predict to be true of hemlock? Check all that apply.
_____ HABITAT: Disturbed areas like the edges of agricultural fields. _____ HABITAT: Pristine, undisturbed meadows. _____ REPRODUCTION: Large numbers of seeds produced at a time. _____ REPRODUCTION: Small numbers of large seeds produced. _____ LIFESPAN: One to two years. _____ LIFESPAN: Several decades.
Among the natural defenses present in tears is the protein lactoferrin. As you can infer from its name, it is also present in milk and other body secretions, and its function involves binding iron ions. The presence of lactoferrin in tears is protective against bacterial infection because
A. pathogens with magnetosomes will be segregated from the eye tissue and swept away by the tears. B. free iron serves as an immune signal to recruit T cells to the eye. C. in the presence of lysozyme, as found in tears, the proteins form a protective barrier on the lens. D. all pathogens must acquire iron from their environment and lactoferrin ensures that the iron concentration is low.
The excretory structures of annelids are referred to as
A. flame cells. B. kidneys. C. protonephridia. D. metanephridia. E. malpighian tubules.
The simultaneous movement of sucrose into a cell against its concentration gradient and protons into a cell with their concentration gradient is best described as an example of
a. symport. b. passive diffusion. c. antiport. d. facilitated diffusion. e. active transport.