Which lineage of Echinoderms is made up of about 2000 species of brittle stars and basket stars, each with elongated, slender, somewhat snakelike arms surrounding a well-defined central disk?
a. Ophiuroidea
b. Echinoidea
c. Holothuroidea
d. Crinoidea
Ans: a. Ophiuroidea
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Culture-independent approaches avoid issues associated with
A) detecting very rare phylotypes. B) conflating phylogenetic and functional diversity. C) growing organisms in the lab. D) next generation sequencing.
Until which period of time did scientists think
that molecules of life could only be made inside living organisms?
a. early 1500s b. late 1500s c. early 1600s d. late 1600s e. early 1800s
Which ocean current runs along the western coast of South America producing cold offshore winds?
A. Gulf Stream B. equatorial countercurrent C. Humboldt Current D. west wind drift current E. east wind drift
The portion of an amino acid that makes the amino acid unique among the 20 different amino acids is
A. peptide bonding. B. the side chain or R-group. C. hydrocarbon. D. amino. E. carboxyl.