An open circulatory system ____
a. contains blood in blood vessels
b. is composed of two circulatory systems
c. mixes hemolymph and interstitial fluids together
d. is more efficient than a closed system
e. opens directly to the outside
ANSWER: c
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The production of second messengers in signal transduction offers at least two advantages, speed and
A. specificity. B. amplification. C. one-to-one stoichiometry. D. reversibility. E. affinity.
A major organism considered to cause food-borne infection is
A. Salmonella. B. Pseudomonas. C. Staphylococcus. D. Bacillus.
Which one of the following is NOT true of biomass?
A. Biomass is greatest in producers. B. Biomass is a measure of productivity. C. Biomass is the dry weight of organisms. D. Biomass shows a loss of 10% at each trophic level.
The specialized structure in a tube worm in which endosymbiotic, chemolithotrophic bacteria live is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).