An organic molecule always contains one or more atoms of _____.
A) sulfur
B) carbon
C) oxygen
D) nitrogen
B) carbon
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Which statement is true about speciation on island archipelagos?
A. Speciation is slow because it depends on emigration from the mainland. B. Most speciation occurs allopatrically. C. Ecological competition may cause new species to go extinct slowing speciation. D. Speciation by polyploidy is most common. E. Species clusters are less common.
In a molecule of DNA, purine bases form ________ bonds with pyrimidine bases.
A) phosphate B) hydrogen C) disulfide D) covalent
The majority of animals caught in shrimp trawls are the shrimp themselves
Indicate whether the statement is true or false
Photosynthetic organisms like grass are able to ________
A) make all of their organic matter from organic molecules in the soil. B) use water they take in through their leaves as a final electron acceptor. C) change the light energy from sunlight into sugars D) use substances in the air as a major source of carbon.