Why aren't insect tracheae associated with capillary beds?
A. Insects have an open circulatory system.
B. Insects have external gills associated with hemolymph vessels.
C. Insects use an air sac respiratory system.
D. Insect capillaries are found only around the gut.
Answer: A
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A microbiologist is conducting a research project on chemolithoautotrophs. This means that the investigator is examining certain aspects of a bacterium that
A. can oxidize inorganic molecules such as ammonia and sulfur for energy B. is a purple non-sulfur bacteria which depends on light. C. obtains carbon from organic molecules. D. can use the energy from sunlight to build organic molecules from carbon dioxide. E. uses light as its energy source and carbon for organic compounds.
Substances NOT usually found in normal human urine are
A. certain drugs. B. urea and uric acid. C. water molecules. D. glucose molecules. E. K+, H+, and other ions.
In the 1920s, Otto Loewi discovered that
a. a frog heart would beat outside the animal. b. the nerve to a frog’s heart released a chemical that affected only that heart. c. neuron endings release a neurotransmitter when stimulated. d. a saline solution caused an isolated frog heart deprived of its own nerve supply to beat more slowly. e. ACh acts on skeletal muscle, smooth muscle, the heart, some glands, and the brain.
Defend this statement: Plants are just as capable of responding to their environment as are animals
What will be an ideal response?