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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

The epigenetic state of a cell is called its ____________________. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

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

Biology & Microbiology