While cataloging fish living in a nearby lake, you find an example of a species that you initially mistake for a hagfish, but further inspection shows that it has a true cerebellum, a rudimentary vertebral column parallel to its notochord, and eggs that are fertilized externally. To what class of fish does this species belong?
a. Chondrichthyes
b. Myxini
c. Petromyzontida
d. Osteichthyes
c. Petromyzontida
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Toxic oil compounds' effects on the invertebrates include(s):
a. tainted flesh moving up the food chain. b. all invertebrates are tolerant of oil pollution. c. acting like a narcotic. d. both a and c
Rita Colwell noted that outbreaks of cholera are
related to a. increasing sea surface temperature. b. oceanic thermal inversions. c. oceanic upwellings. d. decreasing sea surface temperature. e. the reversal of the Humboldt Current.
The process in which carbon from an inorganic source, such as carbon dioxide, gets incorporated into an organic molecule is called ____________.
A. carbon fixation B. the Calvin–Benson cycle C. light-dependent reaction D. metabolic regeneration E. phosphate-group transfer
DNA does not exist as a naked double helix in the nucleus of a cell, but is complexed with proteins to form a fine filamentous material called _________.
Fill in the blank(s) with the appropriate word(s).