The first part of the small intestine is the
a. duodenum.
b. ileum.
c. pylorus.
d. cecum.
e. jejunum.
Answer: a
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An organism that grows specifically on nonliving organic material is called
(a) an autotroph. (b) a heterotroph. (c) a parasite. (d) a saprophyte.
Following the Deepwater Horizon accident in the Gulf of Mexico in 2010, bioremediation was used to eliminate much of the oil from the contaminated water. To encourage the growth of oil-degrading microbes, "fertilizer" including iron and nitrogen was added to the water. Which of the following statements regarding the growth of these microbes is incorrect?
A. The oil-degrading microbes used oil (hydrocarbons) as their carbon source. B. The concentration of sulfate in the Gulf of Mexico is sufficient for the growth of oil-degrading microbes. C. Large amounts of iron were needed, as iron is a macronutrient for oil-degrading microbes. D. Nitrogen gas (N2) present in air is not in a form that can be used by oil-degrading microbes.
Why aren't insect tracheae associated with capillary beds?
A. Insect capillaries are found only around the gut. B. Insects have an open circulatory system. C. Insects have external gills associated with hemolymph vessels. D. Insects use an air sac respiratory system.
Respiration by means of book lungs is characteristic
of some a. flatworms. b. arthropods. c. annelids. d. mollusks. e. gastropods.