What element is used to link nucleic acids in all organisms?
a. Carbon
b. Nitrogen
c. Silicon
d. Phosphorus
ANS: D
Phosphorus is also used to carry energy within the cell. Phosphorus enters the ocean via rivers and
precipitation in organic form when organisms die. It then converts to phosphate for further use.
Information can be found in the section Elements Cycle between Living Organisms and Their
Surroundings
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Converting plant sugars into simple sugars creates which biofuel?
A. ethanol B. methane C. propane D. ethane E. butane
The difference between relocation and expansion diffusion stems from:
A. the initial stage of relocation diffusion spreading further than if it was spreading by expansion diffusion. B. expansion diffusion intensifying the concept, idea or trait in the place of origin while relocation does not. C. relocation expansion causing the idea, concept or trait being practiced to wane in its place of origin or even disappear, while expansion diffusion does not. D. relocation diffusion is strictly centralized while expansion diffusion is strictly linear.
Who allowed his ship to be trapped in the Arctic ice for nearly four years to prove that no Arctic continent existed?
a. Nansen b. Mahan c. Murray d. Anderson e. Thomson
Surface currents affect the upper ten meters of water.
a. true b. false