In the Gulf of Mexico, red tides caused by the dinoflagellate Karenia brevis cause massive fish kills as well as respiratory problems in humans. As an environmental scientist, what would you suggest concerned citizens do to help prevent these red tides?
A. Purchase fuel-efficient vehicles
B. Decrease the amount of artificial light in coastal areas
C. Encourage sustainable fishing
D. Reduce fertilizer use on lawns and gardens
E. Participate in beach cleanup efforts
D. Reduce fertilizer use on lawns and gardens
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The human genome consists of approximately _______ base pairs of DNA
A. 100,000 B. 1 million C. 1 billion D. 3 billion E. 2 trillion
In your Ph.D. research, you use thin slices of brain tissue to study neuronal signaling. You attach an electrode to a single neuron, but cannot detect any activity. What is the most likely explanation?
A. When you sliced the brain, you disconnected the cell from its dendrites. B. Neurons are not electrically active -- you should be recording neuroglia instead. C. When you sliced the brain, you disconnected the cell from its neuroglia. D. Excessive myelination is blocking inputs to the cell. 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 neuronal signaling? What other information is related to the question? Choose Answer Given what you now know, what information 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?
The lymphoid organ that is the site of maturation of T-lymphocytes is the ____.
What will be an ideal response?
A possible reason why humans have fewer genes than the number anticipated by scientists is that
a. humans don’t need more than 25,000 genes to function. b. the exons used to make a specific mRNA can be rearranged to form different proteins. c. the sample size used to sequence the human genome was not big enough, so the number of genes estimated could be low. d. the number of genes will increase as scientists find out what all of the noncoding DNA actually does.