You are exploring a distant planet and find an interesting ecosystem in a lake of liquid methane. Tiny organisms, which you call “quiddles”, are able to use the methane to produce carbon sugars. Other organisms, (widdles), consume the quiddles. You discover that an average widdle weighs three times as much as an average quiddle, and that there are more widdles than quiddles per square meter of the lake. How would you describe the ecological pyramids based on these results?
A. An inverted pyramid of energy, and an inverted pyramid of biomass
B. A standard pyramid of numbers, and a standard pyramid of biomass
C. An inverted pyramid of numbers, and an inverted pyramid of biomass
D. A standard pyramid of numbers, and an inverted pyramid of biomass
C. An inverted pyramid of numbers, and an inverted pyramid of biomass
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Collagens are associated with which of the following types of cellular junctions?
A) gap junctions B) tight junctions C) plasmodesmata D) adhesive junctions E) none of the above
According to studies by Norman Terry and coworkers, some plants can perform a version of
bioremediation of selenium in wastewater by
a. converting selenium to a form that kills waterfowl. b. using selenium to make a necessary supplement for humans. c. converting selenium into a relatively nontoxic gas. d. storing selenium in the soil. e. increasing the selenium concentration in the water.
Which of the following is an example of gene regulation at the posttranslational level?
A. Initiation of protein synthesis B. Alteration of protein structure C. Early termination of an mRNA transcript D. Prevention of RNA synthesis
Which of the following would be a way of finishing this hypothesis about the function of the Golgi apparatus? If the Golgi apparatus is involved in packaging products for secretion, then
A. the Golgi apparatus would contain proteins. B. the Golgi apparatus must be part of the endomembrane system. C. vesicles must travel from the RER and SER to the Golgi apparatus. D. vesicles must travel from the Golgi to the cell surface. E. the Golgi apparatus must consist of 3 to 20 slightly curved sacs.