The efficient exchange of gases in gills is an example of countercurrent exchange. Indicate whether the statement is true or false
True
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Red algae:
a. can live at greater depths than green algae b. are thought to have developed from green algae c. contain xanthophylls as their main accessory pigments d. contain no chlorophyll a e. are mostly freshwater algae
Tracers are elements that
a. are used in minute amounts in plants. b. can be monitored through biochemical reactions. c. must be inert. d. have an unbalanced electrical charge. e. must have a stable nucleus
Leukocyte movement from blood to the site of tissue damage or infection involves ________, leukocyte movement toward the blood vessel wall; ________, the movement of leukocytes between endothelial cells of the blood vessel; and ________, the movement within the tissue to the site of injury.
A) margination : diapedesis : chemotaxis B) diapedesis : margination : chemotaxis C) chemotaxis : diapedesis : margination D) margination : chemotaxis : diapedesis E) chemotaxis : margination : diapedesis
What ability is found in stem cells that are totipotent?
A) Totipotent cells can only develop into blood cells. B) Totipotent cells can develop into any cell type. C) Totipotent cells can transform skin into muscle cells. D) Totipotent cells can change the genetic code of an organism.