The portion of a molecule which elicits an immune response is called
A) a mosaic.
B) a hapten.
C) an epitope.
D) an alloantigen.
Ans: C) an epitope.
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Clostridium difficile is a bacterium that is often found in the gastrointestinal tract of healthy individuals. It is also a common cause of hospital-acquired infections
Most individuals who become ill with C. difficile do so following antibiotic treatment. This information suggests that: A. C. difficile is not pathogenic (diseasecausing) in healthy people. B. C. difficile is resistant to antibiotics and antiseptics used in the hospital setting. C. C. difficile is adapted to the human gastrointestinal tract. D. C. difficile rebels when other organisms are eliminated from their environment.
What are the genes that code for positive cell-cycle regulators, like Cdk, called?
a. oncogenes b. tumor suppressor genes c. proto-oncogenes d. mutated genes
Which of the following examples would be undergoing secondary succession? Check all that apply.
_____ an abandoned potato farm _____ a coastal grassland damaged by a hurricane _____ an abandoned landfill _____ rocks in a national park covered by mosses and lichens _____ a garden bed that has been weeded 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 secondary succession? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection 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?
The ratio of energy consumed at the next trophic level over what is produced is known as
A) consumption efficiency. B) trophic efficiency. C) food chain efficiency. D) detrital efficiency.