Virulence factors include except

a. toxins
b. enzymes
c. capsules
d. phagocytes


Ans: d. phagocytes

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Neurotransmitters move by active transport across the synaptic cleft

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

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

Biology & Microbiology