Which of these structures most closely resembles a vertebrate nephron?
A) Protonephridium
B) Malpighian tubule
C) Nephrostome
D) Flame cell
E) Nephridium
E
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Consider the structure of a trophic pyramid when answering the following questions: Why are shrimp more abundant than whales in the ocean?
A. Whales reproduce more slowly, so maintain small population sizes. B. More energy is available to primary consumers, and thus the biomass/abundance of primary consumers is greater than that of secondary consumers. C. Whales are warm-blooded secondary consumers and lose more energy as heat, therefore their level on a trophic pyramid is smaller (more narrow) than for shrimp (primary consumers). D. The levels of the trophic pyramid represent the percentage of primary producers that make up a consumer's diet. Whales eat less of the primary producers, so their level on a trophic pyramid is smaller than the level for shrimp.
Which of the following is capable of enzymatic activity?
a. lipids b. proteins c. carbohydrates d. minerals e. vitamins
The relative number of reproductively viable offspring produced by individuals is called ________
A) immigration B) homology C) taxonomy D) fitness
The common infection known as "pink eye" is an infection of the
A) sclera. B) cornea. C) iris. D) conjunctiva. E) retina.