Out of the estimated total of 9 liters of material passing through the small intestine, how much of it is absorbed in the small intestine?
A. about 50 milliliters
B. about 350 milliliters
C. about 4.5 liters
D. about 8.5 liters
E. all of it
D. about 8.5 liters
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Which of the following statements about the mouse is FALSE?
a. Its scientific name is Mus musculus. b. Females give birth to offspring about three weeks after mating. c. It has been used to disprove the "inheritance of acquired characters" hypothesis. d. Knockout mice are those that carry a lethal allele. e. Knockout mice are those that have a gene that is completely nonfunctional.
During which stage of meiosis does crossing over occur?
A. anaphase I B. prophase I C. prophase II D. telophase II
What major benefits do plants and mycorrhizal fungi receive from their symbiotic relationship?
A) Plants receive enzymes, and fungi receive nitrogen and phosphorus. B) Plants receive increased root surface area, and fungi receive digestive enzymes. C) Fungi receive photosynthetic products in exchange for living in plant root nodules. D) Plants receive nitrogen and phosphorus, and fungi receive photosynthetic products.
An axenic culture is one which
A. is obtained from a clinical sample. B. is grown as a broth culture. C. contains only a pure culture. D. contains mixed microbiota. E. contains only pathogens.