Amino acids are linked together by peptide bonds in a ____
A. starch.
B. polypeptide.
C. polysaccharide.
D. nucleic acid.
E. phospholipid.
B. polypeptide.
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A covalent chemical bond is one in which _____
A) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms C) outer-shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals D) outer-shell electrons of one atom are transferred to fill the inner electron shell of another atom E) electrons from the same atom, but opposite spins, are paired
Which of these structures is a covering for the gill chamber in ray-finned fishes?
a. swim bladder b. spiral valve c. operculum d. atrium e. lateral-line system
Cells that can detect and respond to a hormone are known as
a. target cells. b. regulator cells. c. receptor cells. d. messenger cells. e. endocrine cells.
The endosymbiotic theory is supported by the work
of __________ on bacteria-infected Amoeba proteus. a. Stanley Miller b. Jeon Kwang c. Thomas Brock d. Lynn Margulis e. Australian researchers