Protozoan and helminthic diseases are difficult to treat because
A) their cells are structurally and functionally similar to human cells.
B) they replicate inside human cells.
C) they do not have ribosomes.
D) they do not reproduce.
E) they have more genes than bacteria.
A
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Based on four generations of data, does the inheritance of this trait appear to be related to the sex of the offspring?
a. Yes b. No
A one-way relationship in which one species
benefits at the expense of another is a. commensalism. b. competitive exclusion. c. parasitism. d. obligate mutualism. e. a neutral relationship
____ is the site of protein synthesis
A. Ribosomes B. Nucleus C. Mitochondria D. Smooth endoplasmic reticulum
Hornworts differ from mosses and liverworts in containing
A. spores. B. gametophytes. C. sporophytes. D. photosynthetic sporophytes. E. small leaves.