Blood vessels show which sign of aging?
a. elastin fibers in their walls are replaced by collagen or calcium deposits
b. they become softer and expand more easily
c. the smooth muscle layer constricts more readily
d. elastin fibers double in quantity
e. veins develop more valves
A
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Peroxisomes
A) are not derived from the endoplasmic reticulum. B) are bounded by double membranes. C) possess acid phosphatase activity. D) possess amylase activity. E) all of the above
Suppose a living plant cell has ? = ?S = ?0.5 MPa. If the plant cell is placed into a beaker filled with a solution with
? = 0, then the cell should ____.
a. take up water until it bursts b. lose water until its ? = ? of the solution c. take up water until within the cell ?P = ? d. take up water until its ? = ?S of the solution e. lose water until its ?S = its ?P
Receptors in the human nose are
a. chemoreceptors. b. mechanoreceptors. c. photoreceptors. d. nociceptors. e. none of these.
Which treatment is intended to lower microbial counts on eating and drinking utensils to save public health levels?
a) Sanitization b) Sterilization c) Pasteurization d) Antisepsis