How does the nerve cord of chordates differ from the nerve cord of animals in other taxonomic groups?
A) It is surrounded by bone.
B) It develops from the gill slits.
C) It does not develop until after the embryonic period.
D) It does not extend into the tail.
E) It runs along the dorsal side of the body.
E
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Secondary structure is characterized by which one of the following types of interactions?
A. hydrogen bonding within the peptide backbone B. a covalent bond between two cysteines C. ionic bonding between an acidic side chain and a basic side chain D. hydrogen bonding between side chains of amino acids E. the covalent bond between an amino nitrogen and a carboxyl carbon
Substances that can readily pass through the cell membrane are chemically ________ in nature
Fill in the blank with correct word.
Animals with chemical defenses are also typically:a
fast runners. b. aposematic. c. small in size. d. large in size. e. camouflaged.
Flatworms are the most primitive animal phylum to have:
A) organs. B) muscle tissue. C) asymmetry. D) a circulatory system. E) radial symmetry.