What did R. H. Whittaker base his five kingdom classification upon?
a. DNA sequencing analysis
b. The size and color of cells
c. The biochemical make-up of an organism
d. Cell structure and how an organism derived its nutrition
e. The ability to for an organism to reproduce and develop
d
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Proteins that are involved in the regulation of the cell cycle and that show fluctuations in concentration during the cell cycle are called _____
A) ATPases B) kinetochores C) kinases D) estrogen receptors E) cyclins
Tetanus prevents the release of neurotransmitters from
A. muscle cells. B. excitatory neurons. C. inhibitory neurons. D. tetano cells.
__________ is the evaporation of water from plant parts, mainly at stomata, into air. Fill in the blank(s) with the appropriate word(s)
There are how many different kinds of amino acids
in proteins? a. 3 b. 6 c. 12 d. 20 e. 28