You have decided to repeat Palade's experiments on the endomembrane system. You think you've done everything correctly, but when you observe your final sample under the microscope, you find that the entire endomembrane system contains tiny black dots. When you look at later timepoints you see the same thing. What part of the experiment did you forget?
A. You forgot to add radioactive amino acids.
B. You forgot to add osmium tetraoxide.
C. You forgot to add the silver-containing emulsion.
D. You didn't forget anything, this is what the experiment is supposed to look like.
E. You forgot to add nonradioactive amino acids.
Answer: E
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Consider the global nitrogen cycle depicted in the figure above. How are humans altering this cycle?
A) industrial nitrogen fixation B) nitrogen lost to the atmosphere C) reduction of nitrogen available to terrestrial ecosystems D) reduction of nitrogen fixation by bacteria E) permanent burial of nitrogen in coastal environments through runoff
In addition to fertilizing the egg, sperm also ____
a. assist the fertilizing sperm in penetrating the egg b. trigger chemical changes in the egg c. dissolve the outer barriers surrounding the oocyte d. release chemicals to speed cell division in the zygote e. trigger chemical changes in the egg that prevent the entry of more than one sperm
Respiration
a. is only necessary for mammals. b. in most animals involves both the circulatory and respiratory systems. c. must occur over a dry surface. d. is an anaerobic process. e. is only necessary for mammals, and must occur over a dry surface
Which statement is FALSE regarding science?
(a). Science helps us to understand the natural world. (b). Science strives to be objective rather than subjective. (c). Correct scientific conclusions are permanent and never subject to change or refinement. (d). Information is gathered by scientific methods. (e). Information is gathered by scientific methods.