The helices and sheets of amino acids form a protein's
A. primary structure.
B. secondary structure.
C. tertiary structure.
D. quaternary structure.
B
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If a lung were to be found in a mollusc, where would it be located?
A) mantle cavity B) coelom C) incurrent siphon D) visceral mass E) excurrent siphon
The dominant stage in the life cycle of tracheophyte plants is the
A. angiosperm generation. B. sporophyte generation. C. spore generation. D. epiphyte generation. E. gametophyte generation.
A mutation that results in the addition or deletion of a single nucleotide that radically changes the amino acid sequence of the resulting polypeptide is known as a ________ mutation.
Fill in the blank(s) with the appropriate word(s).
Membrane delimited intracellular structures that perform specific functions in cells are called
A. organs. B. organelles. C. tissues. D. systomis.