The production of uric acid is complex and energy intensive, yet it persists as a means of nitrogenous waste disposal in many organisms. What advantage does uric acid excretion offer over urea excretion?
a. Uric acid can be metabolized for energy.
b. Uric acid excretion does not require oxygen.
c. Uric acid excretion conserves water.
d. Uric acid stimulates the immune system.
c. Uric acid excretion conserves water.
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The chemokine CCL2
A) attracts basophils, eosinophils, monocytes, and dendritic cells. B) stimulates production of inflammatory mediators. C) organizes an antigen specific immune response. D) attracts basophils, eosinophils, monocytes, and dendritic cells; stimulates production of inflammatory mediators; and organizes an antigen specific immune response.
Is this statement true or false? Body cells may inherit three or more of each type of chromosome characteristic of the species, a condition called polyploidy
Indicate whether the statement is true or false
A population age structure diagram showing roughly equal numbers in each age group, such as in the United States population pyramid, depicts a
A. stable population.
B. population facing extinction.
C. declining population.
D. growing population.
E. very small population size.
Which of the following is the main difference between the urinary system of males and females?
a. Men have two urethras, while women have only one urethra. b. The urethra is shorter in females. c. Men have longer ureters than females. d. Kidneys tend to be larger in females. e. The female urethra passes through the prostate gland.