The greatest number of pathogens enter the body through the ________.
A. skin
B. respiratory system
C. gastrointestinal system
D. urinary system
E. genital system
Answer: B
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The passage of an arthropod through stages from egg to adult is
A. differentiation. B. evolution. C. graduation. D. metamorphosis. E. succession.
In a lichen, the photobiont usually receives
a. nutrients. b. protection from herbivory. c. aid in sexual reproduction. d. enhanced dispersal of offspring. e. shelter from radiation and desiccation.
In which organ does the smooth ER inactivate drugs and harmful metabolic byproducts?
a. brain b. kidney c. liver d. heart e. spleen
Chromosome inversions often result from a multistep process that begins when radiation causes ________
A) a duplication event, followed by reannealing of chromosomes B) four double-stranded breaks in a chromosome C) two double-stranded breaks in a chromosome D) two single-stranded breaks in a chromosome