Which of the following statements is NOT true of protistan cysts?
A. They may arise from asexual reproduction.
B. They may arise from sexual reproduction.
C. Their consumption can lead to human health problems.
D. They facilitate the spread of pathogens from one host to another.
E. They attach to host cells by small hooks.
E. They attach to host cells by small hooks.
You might also like to view...
Pseudonocardia is an organism that is hosted by
A. ants that cultivate fungal gardens. B. wood-eating insects. C. people with severe acne. D. marine invertebrates.
In bilateral animals, _____ is contained within a cavity, cushions the gut during body movements, and is a means by which materials are distributed throughout the body
a. a coelom b. mesoderm c. a mantle d. a water-vascular system e. coelomic fluid
Geographic isolates of a particular species that differ from other populations by one or more characteristics are considered to be
A) clines. B) subspecies. C) evolutionary "dead ends." D) ecotypes.
Keystone species involve _______.
a) species that have disproportionately large effects relative to their abundance b) certain small areas that hold unusually large number of species c) two species which cannot occupy the same niche in a habitat d) nonnative species introduced into a new ecosystem that cause native species to go extinct