Prokaryotes may use several different terminal oxidases for the electron transport system.
Answer the following statement true (T) or false (F)
True
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Why are food chains relatively short?
A) Top-level feeders tend to be more numerous than lower-trophic-level species. B) Top-level feeders tend to be small but are capable of conserving more energy. C) Longer chains are less stable and energy transfer between trophic levels is inefficient. D) There are only so many organisms that are adapted to feed on other types of organisms. E) Food chain length is ultimately determined by the photosynthetic efficiency of producers.
There are five antibody classes: __________, __________, __________, __________, and
__________. (Ig stands for __________.) Fill in the blank(s) with the appropriate word(s).
Which of the following is transported in greater
quantities in the lymphatic system than in the blood? a. red blood cells b. wastes c. fats d. amino acids e. white blood cells
Which of the following does NOT occur during the development of dental caries?
a. Streptococcus mutans uses dextran to attach to teeth and gums. a. Oral microflora produce high concentrations of exoenzymes when sucrose is present. b. Lactic acid dissolves calcium phosphate, causing decalcification of the tooth enamel. c. Oral biofilm microflora produce high concentrations of organic acids.