In both nematodes and flatworms, wastes are removed by _______.
a. circulation
b. osmosis
c. diffusion
d. respiration
c. diffusion
Neither flatworms nor nematodes have specialized excretory systems. They remove wastes through diffusion.
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Within a cell, the amount of protein made using a given mRNA molecule depends partly on _____
A) the degree of DNA methylation B) the rate at which the mRNA is degraded C) the presence of certain transcription factors D) the number of introns present in the mRNA E) the types of ribosomes present in the cytoplasm
Which of the following is true about temporal variation in community biomass?
A. It cycles faster in communities with low species richness. B. It increases with increases in species richness. C. It decreases with increases in species richness. D. It cycles faster in communities with high species richness. E. It is usually low because community biomass is very stable over time.
During the time American youth are awake, the activity that consumes more of their time than any other is:
A. sports B. media involvement C. sex D. school E. Unanswered
Most nosocomial infections of the urinary tract are caused by
A) Escherichia coli. B) Enterococcus. C) Proteus. D) Klebsiella. E) Pseudomonas.