Answer the following questions true (T) or false (F)
1. The job of an ecologist is to preserve the natural world.
2. All the members of a single species of frog in a particular pond would be an example of a population.
3. A community of organisms and the physical environment with which they interact is an ecosystem.
1. FALSE
2. TRUE
3. TRUE
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Buffer solutions:
A. work best when the pH of the buffer is two pH units above its pKa. B. have a greater buffering capacity at lower concentrations. C. buffer best when almost entirely in the conjugate base form. D. have a characteristic Ka, which can be expressed as [HA]/[A-][ H3O+]. E. do not change very much when H3O+ and OH- are added.
Human bites and animal bites caused by ________ and _________, respectively, can ultimately lead to an underlying bone infection
a. Eikenella corrodens; Actinomyces spp. b. Pasteurella multocida; Peptostreptococcus spp. c. Prevotella spp.; S. aureus d. E. corrodens; P. multocida
The secretory systems of Type III and Type IV pathogenic bacteria differ in their mode of attacking cells in what way?
A. Type III systems bind to the cellular membrane by slimy mucilage and toxins diffuse across the membrane, whereas Type IV systems infect cells using pili as transfer tubes. B. Type III systems infect cells using pili as transfer tubes whereas Type IV systems bind to the cellular membrane by slimy mucilage and toxins diffuse across the membrane. C. Both systems attach to cells in the same way but they differ merely in the chemicals that they inject into the host cell. D. Type III systems use flagella modified as "syringes" to inject materials into cells they are infecting whereas Type IV systems use modified pili as transfer tubes. E. Type III systems use modified pili as transfer tubes whereas Type IV systems use flagella modified as "syringes" to inject materials into cells they are infecting.
Microbial Syntrophy cleans up oil!
What will be an ideal response?