Virulence factors include except
a. toxins
b. enzymes
c. capsules
d. phagocytes
Ans: d. phagocytes
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A red blood cell placed in a beaker of solution immediately begins to swell and ultimately bursts. This occurs because
the cytoplasm of the cell was ____ to the solution in the beaker, which was ____.
a. hypertonic; hypotonic b. hypotonic; hypertonic c. hypotonic; isotonic d. hypertonic; isotonic e. isotonic; hypotonic
A change in chromosome number during
fertilization can lead to
a. sympatric speciation. b. disruptive selection. c. directional selection. d. hybrid sterility. e. allopatric speciation
Neurotransmitters move by active transport across the synaptic cleft
____________________ Indicate whether the statement is true or false.
During cytokinesis in an animal cell, a constricting ring pinches the dividing cell into the two daughter cells. This contractile ring is formed by which of the following structures?
a. Centrioles b. Microtubules c. Microfilaments d. Z discs e. The spindle apparatus