Body appendages as diverse as crab legs, beetle legs, sea star arms, butterfly wings, fish fins, and mouse feet start out as ____.
A. clusters of cells in the limb buds
B. cerebral cells
C. cardiac cells
D. offshoots of the sperm cell
E. offshoots of the egg
Answer: A
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A DNA barcode system uses a nuclear gene that varies greatly between species
a. True b. False
What is the natural function of restriction endonucleases?
a. research applications b. DNA manipulation in vitro c. defense against viruses that infect bacteria d. regulating bacterial gene expression e. breaking phosphodiester bonds in mammalian DNA
Adult members of this lineage of Cnidarians are predominately medusae. They are the true jellyfishes,
and are not active swimmers.
a. Hydrozoa b. Scyphozoa c. Trematoda d. Cubozoa e. Anthozoa
Stanley Miller's experiment that applied electric sparks to a reducing atmosphere of methane, ammonia, water, and hydrogen showed that under these conditions,
a. nucleotides can form. b. amino acids can form. c. amino acids can polymerize into polypeptides. d. nucleotides can polymerize into nucleic acids.