Nitrogen is available to plants mostly in the form of _____
A) nitrogen in the atmosphere
B) nitrite ions in the soil
C) uric acid from animal excretions
D) nucleic acids from decomposing plants and animals
E) nitrate and ammonium ions in the soil
Answer: E
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Symbiotic chemosynthetic bacteria obtain oxygen from their hosts through:
a. hemoglobin. b. myoglobin. c. sulfide-binding proteins. d. luciferin. e. breaking down cellulose.
Fossils may be
A. formed when plant resin or tar preserves the specimen. B. formed when organic matter is replaced by minerals, turning to stone. C. All of the answer choices are correct. D. from impressions left after an organism decays. E. casts from footprints that have filled with mud and then turned to stone.
All fungi
a. are saprobes. b. digest food extracellularly. c. are parasites. d. digest food intracellularly. e. can ingest food particles
Which of the following is an example of commensalism?
A. a tapeworm living in the intestines of a mule deer B. barnacles hitching a ride on the skin of a whale C. a female mosquito sucking blood from a musk oxen D. wood-digesting flagellates living in the gut of termites E. acacia trees and their ants Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about commensalism? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?