Mercury can enter aquatic food chain and collect in fish as well as people who eat fish. This is an example of which of the following processes?
A) salinization
B) biological magnification
C) biological accumulation
D) biotic potential
E) bioremediation
Ans: B) biological magnification
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In some ciliate protozoa, the codons UAA and UAG encode glutamate, rather than acting as STOP codons. How does this compare to other species?
A. This is unusual – almost all species share the same “universal” genetic code. B. This is typical – every species has its own unique genetic code. C. This is not unusual – while most species have a similar genetic code, there are often variations for some of the amino acids. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the genetic code? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A group of vertebrates that do not have bone are the
A. ray-finned fishes. B. sharks. C. amphibians. D. reptiles.
Birds are living representatives of which of the following lineages?
a. anapsids b. archosaurs c. lepidosaurs d. synapsids e. crocodilia
A famous marathon runner has been having trouble conceiving, and her doctor has advised taking a break from the sport -- why?
A. Excessive exercise can lower gonadotropin-releasing hormone (GnRH) levels, disrupting ovulation. B. The shaking movement that running produces can prevent implantation of the embryo. C. Excessive exercise can raise humen chorionic gonadotropin (hCG) levels, disrupting ovulation. D. High body temperatures are disruptive to oocyte production, which normally form at 34°C.