Fibroblast cells that uptake cloned MyoD DNA
A. do not contain DNA with muscle-cell-specific enhancer sequences.
B. produce myosin and bHLH protein, but do not produce protein E.
C. probably produce protein E and therefore will not differentiate into muscle cells.
D. produce protein I, myosin, and myogenic bHLH protein.
E. produce protein E, myosin, and myogenic bHLH protein.
E. produce protein E, myosin, and myogenic bHLH protein.
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The equation AB + H2O ? A + B would be catalyzed by which of the following classes of enzymes?
A) oxidoreductases B) transferases C) hydrolases D) ligases E) isomerases
Myasthenia gravis is an example of an autoimmune disease that involves
A. sensitized T cells. B. cytotoxic T cells. C. antibodies. D. IgD.
The nuclear envelope begins to break up in late
a. anaphase. b. interphase. c. metaphase. d. prophase. e. telophase.
Which of the following statements is true?
a. The cell walls of bacteria are composed of peptidoglycan. b. Peptidoglycan is a fatty acid. c. Gram-positive bacterial walls have a relatively thin layer of d. peptidoglycan anchored to the cytoplasmic membrane by teichoic acids.