Which one of the following has had the greatest evolutionary impact on deep-sea organisms?
1.pressure
2.cold temperatures
3.no light
4.none of these
3
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The goal of environmental genomics is to detect as many genes as possible and then, if possible, to determine to the phylogeny of the organisms to which the genes belong
Indicate whether the statement is true or false.
The onset of a given epidemic is indicated by a sharp rise in the number of cases reported daily over a brief interval. This indicates that the mode of transmission is
A) host to host. B) a common source. C) insect vector. D) mechanical vector.
These bacteria ferment sugars, produce lactate, and are used for some food production
a. Lactobacillus b. Bacillus c. spirochetes d. Agrobacterium e. cyanobacteria
Expansins are proteins that loosen up cell walls so cells can elongate. Auxin is thought to activate expansins by
A) aligning cellulose microfibrils. B) activating protons pumps to decrease pH in a section of the cell wall. C) depositing lignin molecules between cellulose fibrils. D) increasing turgor pressure. E) increasing pectin hydration.