Energy enters most ecosystems by the process of
A. fermentation.
B. biosynthesis.
C. photosynthesis.
D. biogeochemical weathering.
E. respiration.
Answer: C
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When E. coli cells produce the amino acid tryptophan, a cluster of five genes is transcribed together. This cluster of genes is referred to as the
A. trp transcriptional operator. B. trp regulator. C. trp suppressor. D. trp operon. E. trp promoter.
Proper design of a urogenital swab expressly intended for the collection of urethral discharge should include what feature?
a. Charcoal-treated cotton or rayon b. Antibiotic-treated calcium alginate c. Non flexible Shaft of wood and not flexi-ble d. Dacron-tipped swabs
Which hormone, made by the kidney, is necessary for red blood cell production by bone marrow?
a. erythropoietin b. hemoglobin c. insulin d. erythrocytes e. leucocytes
Biological wealth is the source of
a. food. b. medicine. c. ecotourism. d. economic opportunity. e. all of these.