Starfish that reproduce by splitting into pieces are reproducing by
A.) binary fission.
B.) vegetative reproduction.
C.) budding.
D.) fragmentation.
Ans: D.) fragmentation.
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The ________ model was proposed by Mitchison and Kirschner to explain how polymerization and depolymerization of microtubules occur simultaneously.
Fill in the blank(s) with the appropriate word(s).
Denaturation of proteins may result in all of
the following EXCEPT a. breakage of hydrogen bonds. b. loss of three-dimensional structure. c. removal of R groups from amino acids. d. alteration of enzyme activity. e. endangerment of a cell's life
Sound amplification happens in the middle ear because of ________
A) size difference between the eardrum and oval window B) lever action of the ossicles C) resonance in the efferent outer hair cells D) stapedial reflex
Systemic acquired resistance is
A. a broad-ranging resistance that lasts for a period of days. B. a response whereby antibodies recognize specific antigens. C. a response that occurs when the hypersensitive response fails. D. the same as the human immune response. E. a method for plants to modify their DNA for protection.