Proto-oncogenes can be converted to oncogenes by:
a. mutation.
b. tumor suppressor genes.
c. growth factors.
d. transcription factors.
e. infection by certain viruses.
a
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Molecules or regions of molecules that readily interact with water are said to be ________, whereas molecules or regions of molecules that are insoluble in water or do not readily interact with water are said to be hydrophobic.
Fill in the blank(s) with the appropriate word(s).
The closest living relatives of birds are
a. mammals. b. snakes and lizards. c. turtles. d. crocodiles. e. amphibians.
Which of the following is not a function of a plant stem?
A. storage of starch B. storage of water C. production of pollen D. support E. protection from predators
The condition in which there is only one representative of a particular chromosome in a cell is called ________
Fill in the blank(s) with correct word