Sue was monitoring the oil spill into the Gulf of Mexico from an oil tanker. From her observations, she noted that the oil was moving as large patches in the water. It did not appear as though the oil was dissolving into the water. Why did the oil not dissolve into the water?
A. surface tension
B. water has a high heat of vaporization
C. hydrophobic interactions
D. sea water acts as a solvent
E. water forms hydration shells
Answer: C
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What is the term for two genes from two different species that are similar in sequence and serve the same function in each species?
A. Related genes B. Paralogs C. Gene family D. Orthologs
The type of muscle that typically surrounds hollow tubes and organs like the stomach is
A. cardiac muscle. B. striated muscle. C. smooth muscle. D. skeletal muscle. E. voluntary muscle.
Scientists disagree about how many species are currently on earth for all of the following reasons EXCEPT:
a) there is controversy over whether natural selection is the only mode of speciation. b) there is not one true definition of species. c) at any one time, there are few populations in the process of speciation. d) there are many organisms on Earth that have yet to be discovered. e) different scientists use different techniques to estimate the actual number of species from the known number of species.
The bacterium Chlamydia has been linked to female infertility and cervical cancer.
a. true b. false