Which large group of animals consists largely of osmoconformers?
A. marine invertebrates
B. bony fish
C. mammals
D. insects
E. amphibians
A
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John Bernal suggested that prebiotic synthesis of polymers took place on clay because
A. Clay minerals are known to bind organic molecules. B. Clay is negatively charged and attracts cations. C. Some minerals in clay attract organic monomers and catalyze chemical reactions. D. Clay minerals can attract and bind organic molecules, catalyze chemical reactions and attract cations. E. Clay is positively charged and can bind organic molecules for polymerization.
The "electrochemical gradient" that determines how a charged ion will move through a permeable membrane depends on
A. the electrical forces acting on that ion. B. the difference in concentration of that ion on either side of the membrane. C. the ratio between the charge on the ion and its atomic mass. D. the combined effects of electrical forces and concentration differences across the membrane. E. All of the choices for this question are correct.
Four of the five animals listed below possess some
type of coelom. Select the exception. a. nematodes b. annelids c. arthropods d. mollusks e. platyhelminthes
Persons having an XXY karyotype are nearly normal males but produce few or no sperm. They have
__________ syndrome. a. Turner b. Klinefelter c. Down (trisomy form) d. Phenylketonuria e. Down (translocation form)