Why are fossils from older species found deeper in the ground than those from more recent species?
Ans: Layers of sediments accumulate every year, covering older fossils in more layers.
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If a fungus encountered a particularly rich food source, what would be the expected result?
A. Hyphae would branch and extend rapidly to form a mycelium. B. Hyphae would stop growing in length, but increase in diameter. C. Individual hyphae would begin to produce spores. D. Hyphae would stop growing and a fruiting body would form to exploit the food source. E. The mycelium would break down into widely separated hyphae.
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.
A patient arrives at a hospital. Doctors take samples and send them to the lab. The lab does 2 test on the samples. I. after gram stain, they found purple bacteria and II. microscopic examination found rod morphology the infecting organism in the patient has
a. mycelia acid b. peptidoglycan c. teichoic acids d. B and C e. A and C
Cody is 4 months old and is given a DTaP injection by his pediatrician as part of the routine immunization schedule. What type of immunity will develop as a result of this?
A. artificial passive immunity B. natural active immunity C. artificial active immunity D. natural passive immunity