Which is NOT a component of blood?
a. erythrocytes
b. osteocytes
c. leukocytes
d. platelets
e. plasma
B
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Synaptic potentials are due to the opening
a. voltage-gated ion channels b. chemically-gated ion channels
After exposure to Agrobacterium tumefaciens bacteria containing both a recombinant T-DNA vector and a helper plasmid, new plants can be grown from single cells in the presence of herbicide. Without the herbicide,
A) neither transformed nor nontransformed cells would survive. B) only nontransformed plants would grow. C) only cells with the helper plasmid would grow. D) both transformed and nontransformed plants would grow.
The tiny chambers in osteons that contain osteocytes are called _____.
Fill in the blank(s) with the appropriate word(s)
The circulatory system of a whale is considered an organ system because it is composed of different
a. cells. b. tissues c. organs d. molecules