In a particular case of secondary succession, three species of wild grass all invaded a field. By the second season, a single species dominated the field. A possible factor in this secondary succession was _____
A) equilibrium
B) facilitation
C) immigration
D) inhibition
E) parasitism
Answer: D
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The cytoskeletal structure(s) that are composed of actin and regulate cell shape, cell movement and muscle contraction include
_____ microfilaments. _____ intermediate filaments. _____ microtubules. _____ microtubules and intermediate filaments. _____ microfilaments and microtubules.
During the early stages of starvation, the amount of fat in the body will steadily decrease, but the amount of protein will drop only slightly. This is known as
A. protein-sparing. B. wasting disease. C. lip-sparing. D. bulimia.
When body temperature is too high, which of the following occurs?
A) Hypothalamus ceases to function. B) Blood vessels in the skin dilate. C) Capillaries contract. D) Skeletal muscles contract.
Why do the instructions for the growth of Neisseria gonorrhoeae recommend a CO2-enriched atmosphere?
A. It uses CO2 as a final electron acceptor in respiration. B. It is an obligate anaerobe. C. is a capnophile. D. It fixes CO2 through photosynthesis