Ice is less dense than water. This is significant in nature because:
1.The surface of a pond is colder than its depths since it has contact with air.
2.If ice formed from the bottom up, all aquatic life would die out each winter.
3.Water on top of ice would keep fish from their food source.
4.Ice could form at any time the temperature was below 32 degrees F.
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Scientists currently theorize that:
A. it is possible to synthesize a simple cell similar to LUCA. B. cells from the Archaea group are most similar to LUCA. C. cells from the Bacteria group can be mutated so they revert to LUCA. D. evolution created LUCA from the Archaea group.
The most acute allergic response is anaphylactic shock, which can be deadly due to the histamine-induced
A) increase in capillary permeability. B) increase in peripheral resistance that decreases cardiac output. C) decrease in peripheral resistance that decreases mean arterial pressure. D) decrease in peripheral resistance that increases cardiac output. E) local decrease in resistance with little effect on mean arterial pressure.
The organisms occupying the base of a pyramid of energy are autotrophs
____________________ Indicate whether the statement is true or false.
Secondary metabolites are often useful, and are obtained by
A) harvesting a culture during log phase. B) allowing a culture to enter stationary phase. C) growing a culture at sub-optimal temperature. D) adding chemicals that alter metabolic pathways. E) using continuous flow culturing.