All organisms plus the nonliving components of a defined area is a(n)
A. population.
B. community.
C. ecosystem.
D. habitat.
E. niche.
Answer: C. ecosystem.
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You are studying the bacteria in the water of a nearby pond. From a 100 mL sample, you use a 0.5 mL subsample to inoculate a plastic dish filled with a semisolid nutrient medium that fosters growth of coliform bacteria. After an appropriate incubation period, you count 100 bacterial colonies growing on the surface of the medium. What conclusion can you make about the coliform bacteria in the pond water?
A. There is approximately one coliform bacterial cell per milliliter. B. There are approximately 200 coliform bacterial cells per milliliter. C. There is approximately one coliform bacterial species per milliliter. D. There are approximately 200 coliform bacterial species per milliliter.
In the development of C. elegans, an embryo of 1090 cells then loses 131 cells. This is an example of what process?
What will be an ideal response?
Activation energy can be provided by the kinetic energy of moving molecules
Indicate whether the statement is true or false
Cell surface receptors that are able to create mechanical stability by tethering cells to the extracellular matrix (ECM) are known as
a) Adhesions. b) Fibrinogens c) Notch receptors d) Integrins