To form organic molecules from inorganic molecules it would have been necessary to have
A. protocells.
B. a source of energy.
C. an atmosphere with ozone.
D. All of these answers are correct.
B. a source of energy.
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Salt marsh cordgrass is consumed by herbivorous marsh periwinkle snails, which in turn are consumed by blue crabs
Research has shown that cordgrass productivity is controlled ____.
a. indirectly by the abundance of snails b. indirectly by the abundance of snail predators c. directly by the abundance of snail predators d. directly by the availability of nutrients in the salt marsh e. indirectly by the amount of sunlight penetrating the water
Which type of bacteria use light energy to build organic molecules from carbon dioxide and water? a. Photoheterotrophs b. Photoautotrophs c. None of these choices
d. Chemoautotrophs e. Chemoheterotrophs
Which compound is NOT soluble in water?
a. olive oil b. table salt c. sugar d. albumin e. sucrose
If one left a "pasteurized" flask of broth for a long time at room temperature, it would stay sterile forever, at least in principle.
Answer the following statement true (T) or false (F)