The feeding chambers inside the sponge are lined with specialized cells that generate a directed water current through the sponge and trap and ingest microscopic food particles. What are these cells called?
a. amoebocytes
b. sclerocytes
c. choanocytes
d. pinacocytes
c. choanocytes
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Events X and Y are independent of each other. If the probability of event X occurring is 1 in 4, and the probability of
event Y occurring is 1 in 5, the probability of both events occurring is ____.
a. (1/4)2 + (1/5)2 = (1/16) + (1/25) = (25/400) + (16/400) = 41/400 b. (1/4) + (1/5) = (5/20) + (4/20) = 9/20 c. (1/4)2(1/5)2 = (1/16)(1/25) = 1/400 d. (1/4)(1/5) = 1/20 e. (1/4 + 1/5)2 = (5/20 + 4/20)2 = (9/20)2 = 81/400
A collapsed lung occurs when the pressure in the ____
a. atmosphere increases b. alveoli increases c. pleural cavity increases d. trachea increases e. bronchioles decreases
The epigenetic state of a cell is called its ____________________. Fill in the blank(s) with the appropriate word(s)
The chemical name for table salt is sodium chloride, or simply NaCl. What type of chemical is NaCl?
A) Compound B) Element C) Molecule D) Ion