Disease ________ is measured by the total number of new reported disease cases within a population over a period of time
A) incidence
B) frequency
C) morbidity
D) prevalence
Answer: A
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Results from the study of globin variants indicate that ____
a. all amino acid substitutions cause severe phenotypic effects b. a change in a single nucleotide is sufficient to cause a genetic disorder c. extended chains of phosphorus molecules function to carry oxygen d. all of the changes in globin are due to changes in amino acid sequences e. sickle cell anemia is not primarily an inherited disease
Allelochemicals are active in preventing
a. herbivore feeding. b. germination of plant competitors. c. infection by pathogens. d. all of the above.
The bacterium that causes botulism disease is harmless until it:
a. is infected by prions. b. is infected by lytic bacteria. c. is irradiated by UV radiation. d. contains a certain prophage DNA. e. is infected by certain retroviruses.
All capillary beds have blood running to them at all times.
Answer the following statement true (T) or false (F)