What is the normal concentration range of the formed element that comprises the blood component labeled III in the figure?
a) 400,000-1 million cells/ÃŽ ¼L
b) 150-200 cells/ÃŽ ¼L
c) 4.8-5.4 million cells/ÃŽ ¼L
d) 150,000-400,000 cells/ÃŽ ¼L
e) 5,000-10,000 cells/ÃŽ ¼L
c
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Which statement is FALSE with regard to proteins?
A. Their roles in the body include acting as enzymes, providing structural support, and signaling between cells. B. They are macromolecules with subunits linked by polypeptide bonds. C. They are polymers made up of amino acids. D. They are composed of nucleic acids. E. They make up a greater percentage of body mass than carbohydrates do.
Which of the following substances increases in abundance during cellular respiration?
A. Glucose B. Glycogen C. Oxygen D. ATP
Intracellular signaling pathways within target cells are organized such that
A. each step allows for amplification of the signal where one molecule can activate many. B. each step involves one molecule activating or synthesizing exactly one other molecule for precise control. C. enzymes are used up and degraded after each individual reaction they catalyze.
Excessive growth factors or growth factor receptors implicated in the development of cancer can be caused by which of the following?
a) nucleosomes b) tumor-suppressor c) oncogenes