In muscle contraction, which of the following
triggers the power stroke?
a. release of Pi from the myosin head
b. binding of ATP to the myosin head
c. hydrolysis of ATP into ADP and Pi
d. cross-bridge formation between actin and
myosin
e. relaxation of the sarcomere
A
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____________________ are short nucleotide sequences used to begin replication in PCR, and to
which the polymerase adds nucleotides. Fill in the blank(s) with the appropriate word(s).
The tertiary structure of proteins is typified by the:a
association of several polypeptide chains by weak bonds. b. order in which amino acids are joined in a peptide chain. c. bonding of two amino acids to form a dipeptide. d. folding of a peptide chain to form an alpha helix. e. three-dimensional shape of an individual polypeptide chain
The second stage of cellular respiration, ________, takes place only in the mitochondria.
Fill in the blank(s) with the appropriate word(s).
During lengthening and thickening, plant tissues arise from the activity of the ____________.
A. protoderm B. procambium C. meristems D. terminal bud E. immature leaf