Select the incorrectly-matched organism and its primary nitrogenous waste product.
A. mammals—urea
B. reptiles—uric acid
C. most fish—ammonia
D. insects—ammonia
E. birds—uric acid
D. insects—ammonia
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Which of the following is TRUE regarding plasmids?
A. Plasmids are small, usually a few thousand to ten thousand base pairs. B. Plasmids are linear. C. Plasmids are contained within the bacterial chromosome. D. Plasmids are rarely found in prokaryotes. E. Plasmids dominate in eukaryotes.
Could both the food competition hypothesis and the sexual competition hypothesis explain why giraffes have long necks? Why or why not?
a. No. In science, only one hypothesis can be correct. b. No. Observations have shown that the food competition hypothesis cannot be correct. c. Yes. Long necks could be advantageous for more than one reason. d. Yes. All giraffes have been shown to feed at the highest possible height and fight for mates.
Which mode of transmission is not addressed by transmission precautions?
A) airborne B) direct contact C) droplet D) vector E) airborne and droplet
Most often, the largest gradient in water potential is between
A. roots and soil water. B. root xylem and shoot xylem. C. leaf cells and the intracellular spaces inside the leaves. D. xylem and phloem. E. the relative humidity inside the leaf and the relative humidity outside the plant.