Which of the following terms refers to all
species that live and interact in a specific area?
a. biosphere
b. community
c. ecosystem
d. population
e. niche
B
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What level of protein structure, characterized by coils and folds, results from hydrogen bonding between carboxyl and amino groups of the polypeptide chain?
A. primary B. secondary C. tertiary D. quaternary E. both secondary and quaternary
A confused frog deposits its sperm onto a toad's eggs as they are being laid. No offspring develop because the frog's sperm are unable to penetrate the toad's egg. This is an example of
A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.
The various energy levels in an atom of magnesium ( 12
24 Mg) have different numbers of electrons. Use the following numbers to answer questions 68–70. a. 1 b. 2 c. 3 d. 6 e. 8 D 68. number of electrons in the first energy level D 69. number of electrons in the second energy level D 70. number of electrons in the third energy level
A common respiratory problem in the elderly or morbidly obese is
a. asthma. b. sleep apnea. c. bronchitis. d. bronchiolitis. e. the common cold.