The internal skeleton of echinoderms is made of calcium-stiffened ____ that develop from mesoderm
a. ampullae
b. ossicles
c. radial canals
d. ring canals
e. madreporites
ANSWER: b
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Biology is more completely understood using an integrated approach as opposed to a compartmentalized approach
A. true B. false
The structure labeled "F" is the
a. right ventricle. b. left atrium. c. left ventricle. d. right atrium. e. superior vena cava
What is methanogen?
A. An organism adapted to life in a highly salty environment B. An organism that produces a highly salted substance C. An organism adapted to life in a methane gas environment D. An organism that produces methane gas as a metabolic by-product E. An organism that produces methane and carbon dioxide as a metabolic by-product
Which of these is not true of the electron transport chain?
a. The electron transport chain is located on the cristae of the mitochindria. b. The electron transport chain produces more NADH than any metabolic pathway. c. The electron transport chain contains cytochrome molecules. d. The electron transport chain ends when oxygen accepts electrons.