Why does immersion oil improve resolution?
A. It allows light to travel at a uniform speed on its way to the lens.
B. It decreases the working distance.
C. It increases the numerical aperture.
D. It increases numerical aperture and maintains a uniform light speed.
E. It increases the angle of refraction of the light.
Answer: D
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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 nonradioactive amino acids. D. You forgot to add the silver-containing emulsion. E. You didn’t forget anything, this is what the experiment is supposed to look like.
What is the purpose of isolating pure cultures?
What will be an ideal response?
Even though humans don't have tails or gills, they are still chordates; why is this so?
What will be an ideal response?
A common characteristic of Choanoflagellida is
A. a single, unique mitochondria. B. silica covering. C. funnel-shaped, contractile collar. D. space beneath the plasma membrane. E. presence of a plasmodium.