If the F2 generation illustrates a lack of fitness, this is an example of
a. behavioral isolation.
b. gametic isolation.
c. hybrid breakdown.
d. crossing over.
e. hybrid sterility.
C
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Four of the five answers listed below are generalizations of the cell theory. Select the exception
a. Cells are the structural and functional components of living things. b. Cells arise from preexisting cells. c. All organisms are composed of cells. d. Cells are the basic living unit or organization of living things. e. All cells have a nucleus.
What type of infectious agent causes potato spindle tuber disease?
A. Viroid B. Prion C. Virus D. Virino
Which of the following components of the lung secretes a lubricating substance that allows the lung tissues to separate when inflated?
A. Bronchial tube B. Capillary endothelium C. Basement membranes D. Respiratory membrane E. Alveolar epithelium
Ecdysone is a(n)
A) peptide hormone. B) amine derivative. C) steroid hormone. D) iodinated protein hormone made by the thyroid gland. E) gaseous neurotransmitter