The Gulf Stream is part of what scientists call the "great conveyor belt" that circulates water throughout the world's oceans. There is cause for concern that the increase in global warming might stop the conveyor belt
Would this scenario change Europe's climate? A) Yes: The Gulf Stream brings cold water from the arctic to Europe. Without this, Europe's climate is expected to be much warmer.
B) Yes: The Gulf Stream brings warm water from the tropics to Europe. Without this, Europe's climate is expected to be much cooler.
C) No: The climate of Europe is unaffected by ocean currents.
D) No: There are other currents that will take over if the Gulf Stream stops functioning.
B
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Which of the following places was the last to be colonized by humans?
A. Madagascar B. Australia C. United States D. Scandinavia E. New Zealand
The sum total of all the genes in an interbreeding population is the gene pool. Indicate whether the statement is true or false
Which of the following statements best describes the termination of transcription in prokaryotes?
A) RNA polymerase transcribes through the polyadenylation signal, causing proteins to associate with the transcript and cut it free from the polymerase. B) RNA polymerase transcribes through the terminator sequence, causing the polymerase to separate from the DNA and release the transcript. C) Once transcription has initiated, RNA polymerase transcribes until it reaches the end of the chromosome. D) RNA polymerase transcribes through a stop codon, causing the polymerase to stop advancing through the gene and release the mRNA.
Which of the following is not true about diphtheria?
A. it is a zoonosis B. humans can be healthy carriers C. it is prevented with the DTaP vaccine D. it is an upper respiratory infection E. it can be transmitted via contaminated milk.