One type of archaeon, Haloquadratum walsbyi, is shaped like a postage stamp with dimensions of 2 µm x 3 µm x 0.25 µm. What advantage would this shape provide?
A. This shape is more conducive to the formation of biofilm communities.
B. This shape increases the surface to volume ratio enabling more efficient nutrient uptake.
C. This shape is difficult for phagocytic cells to attach to and engulf.
D. This shape enables this bacteria to float on surfaces and obtain better light exposure.
Answer: B
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Differentiation refers to the process by which:
A. fertilized eggs undergo multiple rounds of cell division to become embryos. B. changes in gene expression allow cells to produce the correct proteins at the correct time. C. cells become progressively more specialized during development. D. gene regulation determines which proteins are produced in a given cell during development. E. None of these choices are correct.
Hydrogenation is a chemical process that
a. turns liquid oil to solid fats. b. turns amino acids into proteins. c. turns DNA into lipids. d. creates stable alternative energy sources. e. does none of these
How are lipids different from other categories of biological molecules?
A. They are not organic. B. They will not combine with water. C. They do not have carbon. D. They are much more complex. E. They are not seen in all living things.
Epidemic curves were prepared by plotting number of cases of disease on the Y-axis and dates on the X-axis. Graph would show a steady increase in number of cases over time, followed by a slow tapering.
A. Propagated Epidemic B. Point-source Epidemic C. Common-source Epidemic