The cytoskeleton and motor proteins are important for which of the following processes?
A. cell motility
B. whipping motion of sperm flagella
C. movement of amoeba by lamellopodia
D. muscle contraction
E. All of the choices are correct.
E. All of the choices are correct.
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Housekeeping genes are unmethylated and active in most cells
Indicate whether the statement is true or false
Which of the following statements about plant tissue culture is false?
A. Virus-free crop species can be propagated by culturing meristems. B. Individual cells can give rise to whole plants through tissue cultures. C. Synthetic hormones can be used to selectively promote root or shoot formation. D. Callus tissue can only form roots, not shoots. E. A callus is a mass of undifferentiated cells.
Knowledge of the position and movement of the various body parts is
a. modality. b. sensory projection. c. sensory adaptation. d. proprioception.
How do new viruses arise?
a) mutation of existing viruses b) not taking all your antibiotics c) spread to new host species d) all of the above e) only a and c