The use of a physical or chemical process to destroy vegetative pathogens on inanimate objects is ________.
A. disinfection
B. sterilization
C. sanitization
D. antisepsis
E. degermation
Answer: A
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Flatworms
(a) are radially symmetrical. (b) possess a body cavity. (c) reproduce by parthenogenesis. (d) have tissues derived from all three primary germ layers.
Coralline forms of which group of protists are ecologically important in the formation of coral reefs?
a. red algae b. euglenoids c. green algae d. brown algae e. dinoflagellates
During crossing over, _____.
A) corresponding portions of genetic material are switched between homologous chromosomes B) beneficial combinations of genes are passed intact from parent to gamete C) the better, dominant genes are recombined prior to gamete formation D) all of the choices characterize crossing over
Scientists in Switzerland compared the total surface area of the small intestine in different species of bats. When the calculations were done as if the inner mucosal surface was smooth, the average inner surface area of the intestinal tube was 9.1 cm2 in one species. The mucosal surface area increased to 48 cm2 when the villi were factored in and reached a total of 0.13 m2 after adding in the membrane surface area of the microvilli. Approximately what percent of the total surface area of the small intestine in these bats can be attributed to the membrane surface area of the microvilli?
A. 78% B. 12% C. 55% D. 28% E. 96%