Which species of bacteria can produce the highly useful Ti plasmid, used by biologists interested in genetically engineering resistant crops?

A. Phytophthora infestans
B. Rhizobium radiobacter
C. Striga puccinia
D. Magnaporthe grisea
E. Xylella fastidiosa


B

Biology & Microbiology

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Fish in a marine environment must maintain a relatively constant ion concentration in their tissues and blood. How do the chloride channels in the gills aid fish in the removal of excess ions?

A. The chloride channels create a countercurrent system where ions are lost from the gills and water is absorbed to dilute other ions (NaCl). B. The chloride channels create a countercurrent system where water is lost from the gills and chloride ions are absorbed. C. The chloride channels actively move ions into the gills and water will follow though osmosis. D. The chloride channels actively remove ions from the gills and water will follow through osmosis.

Biology & Microbiology

What is the sex chromosome composition of a person with Klinefelter syndrome?

a. XXX b. XO c. XXY d. XYY e. YY

Biology & Microbiology

Ecotypes are variants within a species that are adapted to local environmental conditions

Indicate whether the statement is true or false

Biology & Microbiology

The formula for glucose is C6H12O6. What is the formula for a polymer made by linking ten glucose molecules together by dehydration synthesis?

A. C60H111O51 B. C60H100O50 C. C60H120O60 D. C60H102O51

Biology & Microbiology