The role of calcium in muscle contraction is to
A. Break the cross-bridges as a cofactor in the hydrolysis of ATP
B. Bind with troponin, changing its shape so that the actin filament is exposed
C. Transmit the action potential across the neuromuscular junction
D. Spread the action potential through the T tubules
Answer: Option B
A. Reverse transcriptase
B. Cytochrome c
C. Bacterial RNA polymerase
D. RNase P
All the following may be methods for the inhibition of microbial growth by antibiotics except
A. Antibiotics disrupt cell wall synthesis
B. Antibiotics interfere with cell membrane function
C. Antibiotics prevent the release of energy from ATP
D. Antibiotics inhibit the synthesis of protein
A feature common to almost all transmembrane proteins is
A. A phosphorylated exterior domain
B. A structure consisting almost exclusively of beta-sheets
C. An amino acid sequence rich in acidic residues
D. An alpha-helical region of about 20 to 25 hydrophobic amino acids
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