The periodic table of the elements was devised by
a. Henri Becquerel.
b. Demitri Mendeleev.
c. Melvin Calvin.
d. Marie Curie.
e. Becquerel and Mendeleev.
Answer: b
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The lineage ____ are the fleshy-finned fishes, with fins supported by muscles and an internal bony
skeleton. Based on the fossil record, tetrapods apparently arose from this group.
a. Petromyzontoidea b. Chondrichthyes c. Actinopterygii d. Myxinoidea e. Sarcopterygii
What type of cell helps to stimulate B cells to produce antibodies?
A) mast cell B) cytotoxic T cell C) helper T cell D) macrophage
The useful magnification of a light microscope is limited by the ________ of the light source being utilized.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not involved in gene cloning?
A. "sticky" ends B. restriction enzyme C. dyes attached to nucleotides D. vector E. host cell