Which of the following statements is not true of fatty acids found in most mammalian cells?
A. They usually contain 12 to 20 carbons
B. Polyunsaturated fatty acids contain conjugated double bonds
C. All double bonds are in the cis configuration
D. Free fatty acids are ionized at physiological pH
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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