In an ecosystem, which measure of energy is necessarily the largest in amount or rate?
a. net primary productivity
b. gross primary productivity
c. plant respiration
d. animal respiration
e. plant and animal respiration combined
B
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A deuterostome is distinguished by a(n):
A. endoderm that becomes a mouth. B. mesoderm that becomes an anus. C. blastopore that becomes a mouth. D. blastopore that becomes an anus.
Some bryophyte species are ____, meaning that they grow independently on another organism
a. tracheophytes b. epiphytes c. parasites d. charophytes e. rhizoids
During the absolute refractory period, the axon membrane cannot transmit another action potential
____________________ Indicate whether the statement is true or false.
A Coulter counter is:
a. a statistical estimation using 15 dilution tubes and a table of numbers to estimate the number of bacteria per mL b. an indirect method of counting organisms c. a device that directly counts microbes as they pass through a tube in front of an electronic detector d. a device that directly counts microbes that are differentially stained with fluorescent dyes