Microbiological contaminants are best described as
A. vegetative microbes present on or in a substance.
B. pathogenic microbes present on or in a substance.
C. unwanted microbes present on or in a substance.
D. any and all microbes present on or in a substance.
Answer: C
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Cilia (select all correct choices):
A. are specialized organelles found on some epithelial cells. B. are used by epithelial cells to move substances along cell surfaces. C. are used by sperm cells for motion. D. None of these choices are correct.
The constant region of an antibody molecule is
A) the binding site for antigens. B) part of the heavy chains only. C) similar in all antibody molecules. D) the binding site for two antigens.
The sphincter between the esophagus and the stomach serves to ________
a. produce digestive enzymes b. generate peristalsis to propel food c. block the flow of substances when it is contracted d. produce bile
Who demonstrated the crossover of homologous chromosomes in experiments on corn plants?
a. Frans Janssen and Curt Stern b. Thomas Hunt Morgan and Alfred Sturtevant c. Harriet Creighton and Barbara McClintock d. Walter Sutton and Theodor Boveri