Which of the following is NOT a function of the lymph vascular system?

a. collecting water and solutes from blood capillaries
b. picking up fats absorbed by the small intestines
c. being a major site for T and B cell activation
d. transporting foreign materials to lymph nodes
e. returning water and solutes to general circulation


ANSWER: c

Biology & Microbiology

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The E. coli lac operon encodes three genes. These genes ____

a. cleave lactose into glucose and galactose, produce transacetylase, and actively transport lactose into the cell b. encode an enzyme that cleaves glucose, a transport protein for active transport, and a transacetylase enzyme for solubilizing lactose in the cytosol c. encode an enzyme that cleaves lactose, a transport protein for active transport of lactose, and a transacetylase enzyme whose function is unknown d. catalyze the synthesis of lactose from glucose and galactose, produce transacetylase, and actively export lactose from the cell e. directly interact with the Lac repressor and initiate their own transcription

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The total number of named species is about

A) 160. B) 1.6 billion. C) 160,000. D) 1,600. E) 1.6 million.

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In flies, what approximate percentage of genes is unique to that genus and not shared with other eukaryotes?

a. 1 b. 10 c. 30 d. 70 e. 95

Biology & Microbiology

Water transport from roots to leaves occurs mainly because of _____

a. pressure flow b. differences in source and sink solute concentrations c. the pumping force of xylem vessels d. transpiration, tension, and cohesion of water e. pressur flow and differences in source and sink solute concentrations

Biology & Microbiology