Environmental conditions often vary spatially but do not tend to change over time in a given place
Indicate whether the statement is true or false
FALSE
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Signal amplification relies on:
A. increasing amounts of ligand as signal transduction proceeds. B. a sequential increase in the different components of the signal transduction pathway. C. increasing numbers of cell-surface receptors as the signal is transduced. D. increased activity of protein phosphatases.
A febrile and pneumonic illness first named in 1976 by scientists at the Centers for Disease Control and Prevention (CDC) who were investigating an epidemic of pneumonia among Penn-sylvania State American Legion members attending a convention in Philadelphia is known as:
a. Philadelphia pneumonia. b. legionnaires' disease. c. tuberculosis. d. rheumatic fever.
Why are epithelial membranes not very thick?
A. Epithelial tissues can only reach a certain thickness because their growth is constrained by microtubules inside the cell membrane. B. Thick epithelial tissues would collapse due to the drying effect of the environment. C. Epithelial tissues are programmed to stop dividing after only a few cell cycles. D. Epithelial tissues are required to support other cells growing on top of the tissue. E. Epithelial tissues play a critical role in transport and must be thin to allow diffusion to occur.
Reduced quantity of red blood cells results in ____.
A. ventricular fibrillation B. hypertension C. leukemia D. anemia E. a stroke