A microbiologist is trying to isolate a pathogen expected to be present in very small numbers from a stool specimen in which there are abundant normal microbiota. Which strategy would most likely accomplish this purpose?
A. Enrichment culture followed by culture on selective agar
B. Culture on differential media
C. Culture in an anaerobe jar
D. Culture on enriched media
Answer: A
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If Escherichia coli is cultured in broth containing both glucose and lactose, it
A. uses lactose preferentially until the supply is exhausted, then uses glucose. B. uses glucose preferentially until the supply is exhausted, then uses lactose. C. uses only the glucose (it cannot use lactose as a source of carbon). D. uses glucose and lactose simultaneously.
If a large 10-km asteroid or comet struck the Earth in the ocean floor, I. large amounts of molten rock would rain down on Earth and cause massive forest fires. II. giant tidal waves would result III. after effects would cause the deaths of most animal life on the planet. IV. thick clouds of dust would form and block out the Sun for an extended period
a. I & IV b. II & III c. I, II, & III d. I, II, III & IV e. II, III, & IV
A couple in which the woman is homozygous dominant and the man has hemophilia A will produce:a
carrier daughters and affected sons. b. affected daughters and affected sons. c. carrier daughters and normal sons. d. normal daughters and normal sons. e. offspring of unknown genotype for this gene.
Where are sperm stored after they are produced?
a. in the vas deferens b. in the epididymis c. in the seminiferous tubules d. in the penis