When a New England farm is abandoned, its formerly plowed fields first become weedy meadows, then shrubby areas, and finally forest. This sequence of plant communities is an example of
A) evolution.
B) a food chain.
C) secondary succession.
D) primary succession.
Answer: C
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The upper respiratory tract usually has a considerable amount of resident microflora in a healthy adult
Indicate whether the statement is true or false.
During moderate but prolonged exercise, most of the
energy for contraction is supplied by a. creatine phosphate. b. aerobic respiration. c. anaerobic respiration. d. fermentation. e. glycolysis.
Children have short eustachian tubes, and are susceptible to ____
a. otitis media b. tinnitus c. congenital deafness d. vertigo e. nerve deafness
Which one of the following is necessary for messenger RNA to be formed in the nucleus?
A. Ribosomes must be present. B. The cell must have an abundant supply of DNA nucleotides. C. RNA polymerase must be present and functioning. D. Chromosomes must be synapsed.