Which of these is the correct formula discussed by Dr. Knoll in the Great Oxygenic Event module (stage 2, click on "Howie")?
A. H2 + O --> H2O
B. CO2 + H2O --> CH2O + O2
C. CH4 + 2O2 --> CO2 + H2O
Ans: B. CO2 + H2O --> CH2O + O2
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Which of the following is NOT an adaptation of mosses for living on land?
A. delayed meiosis B. enclosure of gametes in gametangia C. enclosure of zygotes in the gametophyte D. wind dispersal of gametes E. wind dispersal of spores
Natural selection is best described as
A) increasing the perfection of a species. B) working on the existing variation of traits to favor those better suited to the organism's environment. C) causing the death of a significant proportion of the population. D) the ability to generate new traits that better suit the species. E) driving the species toward an eventual endpoint in which the species possesses the best possible adaptations for that particular environment.
Chronic carriers of Salmonella typhi harbor the pathogen in the
a) pancreas. b) liver. c) stomach. d) gallbladder.
Which one of the following incorrectly matches a molluscan structure with its typical function?
A. visceral mass-houses organs of digestion, excretion, reproduction B. radula-feeding organ C. ctenidia-secretion of the shell (when present) D. foot-locomotion E. nephrostome-collection of nitrogenous wastes