Select the true statement about Helicobacter pylori.
A. It is a gram-positive coccus that causes skin infections.
B. It is a gram-negative spiral bacterium that causes ulcers.
C. It lacks a cell wall and produces a lot of acid.
D. It can be detected by testing for cold agglutinins.
Ans: B. It is a gram-negative spiral bacterium that causes ulcers.
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The transcribed, but not translated, sequence that is immediately upstream of the region that encodes the functional product is called the ________ region.
A. trailer B. coding C. leader D. promoter
The difference between innate immunity and adaptive immunity is that
A) adaptive immunity attacks pathogens; innate immunity attacks microbes. B) innate immunity targets cancers and transplants; adaptive immunity targets viruses and bacteria. C) innate immunity is fast and generalized; adaptive immunity is slow and specific. D) adaptive immunity releases cytokines; innate immunity produces antibodies.
____ food chains tend to predominate in aquatic ecosystems
a. Higher trophic level b. Primary consumer c. Decomposing d. Grazing e. Detrital
Which of the following common epidemiological measurement is calculated by dividing the number of disease-related deaths within a specified period by the number of people with the disease?
A) Morbidity B) Mortality C) Incidence