To test the effect of vitamin D on growth, two groups of rats were raised under identical conditions and fed the same diet. One of the groups received daily injections of vitamin D
The other group received injections of saline, which did not contain vitamin D. All the rats were weighed weekly for 2 months. In this experiment, the control was the
A) average weight gain of the rats. B) 2-month period of time.
C) group receiving vitamin D. D) group receiving saline.
D
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The scientist(s) given credit for adding the third component (which contradicted spontaneous generation) to the cell theory is/are
A. Louis Pasteur. B. Mathias Schleiden and Theodore Schwann. C. Robert Hooke. D. Rudolf Virchow. E. Antony van Leeuwenhoek.
A factory with an office that controls the information sent to separate rooms for each of the manufacturing and shipping processes would be analogous to
a. a virus. c. a prokaryotic cell without a nucleus. b. a prokaryotic cell with a nucleus. d. a eukaryotic cell with a nucleus.
"She got some chromosomes from her grandfather and some from her grandmother." This is best explained by
A. independent assortment. B. cross-over. C. mitosis. D. linked genes.
In the Gram-staining procedure, the primary stain is ________.
A. crystal violet B. safranin C. iodine D. alcohol