Consider the development of a fossil record for a watershed. A current inventory of all species already has been taken. Which microorganisms might you first consider looking for with the objective of developing a microbial fossil record? Why?
Also, what might depth profiling accomplish?
What will be an ideal response?
Answer: Answers will vary, but diatoms are excellent for developing a fossil record of a watershed. Their glasslike cell structure (composed of silica) should remain intact for a long time, and dead diatoms will accumulate in the sediments over time. Assuming that no major changes to the sediment have occurred over time, looking at diatom diversity at different depths could show how the diatom community has changed over time.
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Capsules are particularly important for
A) making bacteria more vulnerable to host defense mechanisms. B) making bacteria less pathogenic. C) protecting bacteria from host defense mechanisms. D) allowing bacteria to become more phagocytic.
Due to the directionality of polymer synthesis, proteins have distinct ________ and ________ ends.
Fill in the blank(s) with the appropriate word(s).
__________ are the structural and functional units of the nervous system
a. Neurons b. Brains c. Nerves d. Dendrites
Arthropods were the first terrestrial animals because their exoskeletons allowed them to withstand
A) the force of gravity. B) ultraviolet radiation. C) starvation. D) high oxygen concentrations. E) lower atmospheric pressure.