The __________ of an infectious disease is the fraction of a population that contracts that disease during a particular time.
Fill in the blank(s) with the appropriate word(s).
Ans: Incidence
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Temperate grasslands and temperate deciduous forests are two different biomes that are located in the same latitudes. Which one of the following abiotic conditions is most likely to account for the differences in their community composition?
A. temperature B. precipitation C. sunlight D. soil nutrients E. a rain shadow
If an individual carries a mutation that results in a complete lack of MHC class I proteins, how would the individual's immune response be affected? Select all correct choices
A. Memory cell antibodies would not be able to attach to antigen epitopes. B. Cytotoxic T cells would not be able to target (and destroy) infected cells. C. Helper T cells would not be able to interact with antigen-presenting cells. D. Plasma cell antibodies would not be able to attach to antigen epitopes.
Based on the classic experiments of Creighton and McClintock with maize, crossing over involves a physical exchange between chromatids. What particular chromosomal characteristic allowed their experiments to succeed?
A) colored bands along the lengths of a chromosome B) a chromosome with a unique cytological marker C) a missing chromosome D) an extra chromosome E) three chromosomes with identical structure
A major reason why fungi can grow and sprout mushrooms so quickly is that:
A) mushrooms are essentially fluid-filled bags and almost entirely water. B) porous connections between cells allow rapid movement of materials toward the growing tips of hyphae. C) fungal spores contain large food reserves. D) fungi cells divide more like bacteria than eukaryotic cells.