Endospores are
A. metabolically inactive.
B. resistant to heat and chemical destruction
C. resistant to destruction by radiation.
D. All of the other choices are correct.
E. living structures.
Answer: D. All of the other choices are correct.
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The direction of water movement across a cell membrane is determined in part by
A. the presence of transporter molecules. B. the levels of ATP in the cell. C. the concentration of solutes inside and outside the cell. D. the amount of pressure inside and outside the cell. E. the concentration of solutes and amount of pressure inside and outside the cell.
Cyanobacteria
a) can fix nitrogen, thus causing many freshwater ecosystems to be limited by phosphorus availability. b) can mineralize phosphorus from wetland sediments, raising phosphorus levels in inland waters to the point of eutrophication. c) mineralize the phosphates in detergent from an organic corm into an inorganic form that can cause algal blooms and eutrophication. d) consume excess N and P in inland waters and so are essential tools for watershed restoration and management e) occur when aquatic ecosystems are disrupted by invasive species, and can cause pathogenic infections of native species, further enhancing the invasive nature of introduced exotic invaders.
You are exploring a distant planet and find an interesting ecosystem in a lake of liquid methane. Tiny organisms, which you decide to call "quiddles", are able to use the methane to produce carbon sugars. Other organisms, which you call "widdles", consume the quiddles. You do some basic sampling and discover that an average widdle is twice as large as an average quiddle, but there are many more quiddles than widdles per square meter of the methane lake. You draw up the three types of ecological pyramids for the methane lake and send them via WarpSpeed Mail to the other members of the research team back on Earth. What types of pyramids will they find when they open the package? Check all that apply.
A. An inverted pyramid of energy B. An inverted pyramid of numbers C. A standard pyramid of energy D. A standard pyramid of biomass E. An inverted pyramid of biomass F. A standard pyramid of numbers
The ________ valve is between the right ventricle and the pulmonary artery
A) semilunar B) tricuspid C) bicuspid D) atrioventricular