Lymphocytes mature in the _____. I) spleen II) thymus III) bone marrow
A) only I and III
B) only I and II
C) only II and III
D) I, II, and III
C
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Which type of nutrient can pass across epithelial cells without any expenditure of ATP?
A. iron B. calcium C. protein D. fat E. magnesium
Chitin-reinforced bristles that protrude outward from the body wall and are used by most segmented
worms to anchor themselves against a substrate are called
a. metanephridia. b. parapodia. c. septa. d. clitella. e. setae.
The mode of action of "Botox" made by Clostridium botulinum is to
a. block release of acetylcholine. b. stimulate excess release of acetylcholinesterase. c. inhibit acetylcholinesterase. d. break down acetylcholine. e. damage nerve fibers.
Coral reefs occur in nutrient-poor areas of the ocean
Indicate whether the statement is true or false