The earliest photosynthesis probably occurred among ________
a. land plants
b. prokaryotes in stromatolites
c. prokaryotes at hydrothermal vents
d. cyanobacteria floating in shallow seas
c
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Plant hormones bind specific cellular receptor molecules that trigger gene expression responses. Which statement is correct concerning these responses?
A. Only cells lacking receptors can bind hormones. B. Only cells in the meristem can respond. C. Only cells that express the appropriate receptors can bind hormones. D. Only cells that have been previously activated can bind hormones. E. None of these choices is correct.
A doctor’s office has run out of the latest flu vaccine, but many patients are asking for it. One of the nurses finds some vials from last year’s batch in a refrigerator. Should they be used?
A. Yes, because the preservatives and refrigeration ensure that the vaccine is still fresh. B. No, because each year the technology to make a good vaccine improves. C. No, because each year the vaccine is made against different subtypes of the flu virus. D. Maybe – the vaccine should be mixed in a test tube with the virus to see if it still inactivates it. 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 flu virus? 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?
Describe how testicular function is controlled by the hypothalamus and anterior pituitary. What will be an ideal response?
In meiosis, sister chromatids separate and move to opposite poles of the spindle during
____________________. What will be an ideal response?