Answer the following questions true (T) or false (F)
1. An antigen is any foreign substance that elicits an immune response.
2. Macrophages and dendritic cells can both be antigen presenting cells.
3. Complement proteins are antibodies produced by skin cells.
1. TRUE
2. TRUE
3. FALSE
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Which of the following properties is likely to be found in a pioneer colonizer of a biofilm on an artificial joint implant?
A. The ability to grow at thermophilic body temperature,(37ºC) B. Surface structures for attaching to tissue C. No susceptibility to reactive oxygen species like peroxides D. The ability to use the titanium from the implant as an energy source
Imagine that NASA discovered a new planet with an atmosphere rich in hydrogen gas, hydrogen sulfide, ammonia and methane. We would call this a(n)
A. reducing atmosphere, because of the availability of hydrogen atoms that can donate electrons. B. reducing atmosphere because the atmosphere would reduce the energy necessary to build molecules. C. oxidizing atmosphere because of the availability of oxygen compounds. D. oxidizing atmosphere because of the lack of oxygen gas. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the reducing atmosphere of the early earth? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
You have identified a protein that you hypothesize is a sigma factor in E. coli that has not yet been characterized. You have purified the protein. What types of experiments could you perform to investigate whether or not the protein is a sigma factor?
What will be an ideal response?
Why is a rhizoid not considered a true root?
A. Rhizoids are not capable of absorbing water. B. Rhizoids lack xylem tissue. C. True roots have mycorrhizal fungi. D. Only true roots are capable of nitrogen fixation. E. Rhizoids lack the capacity to anchor mosses into the substrate.