Organic compounds are distinguished by molecules that contain ________ bonded to other elements
A) nitrogen
B) carbon
C) oxygen
D) hydrogen
B
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Why do we seldom see more than three consumer levels in natural systems?
1.There is not enough energy to support additional levels. 2.Animals haven’t evolved to feed on animals at the third level. 3.Humans take over the role of the fourth-level consumer. 4.There isn’t enough habitat for a fourth level.
The observation that although fresh water habitats account for only 1% of the Earth's water, they are home to 36% of the known species of fish is due to _______ speciation.
A. prezygotic B. postzygotic C. allopatric D. sympatric E. outgroup
What kind of entity is a lichen?
A) an association between a fungus and a brown alga B) an association between a multicellular protist related to the brown algae and a bacterium C) an association between a fungus and cyanobacteria or green algae D) an association between a bryophyte and a fungus
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.