In sponges, spicules are ____
a. fibrous skeletal proteins
b. specialized digestive cells
c. complicated pore openings and passageways
d. needle like skeletal structures made up of silica or calcium carbonate
e. feeding cells with a flagellum surrounded by a collar
ANSWER: d
Biology & Microbiology
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What will be an ideal response?
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The M phase of the cell cycle includes __________ and cytokinesis.
Fill in the blank(s) with the appropriate word(s).
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In mammals, the master clock is located in the:a
pineal gland. b. suprachiasmatic nucleus. c. crepuscular gland. d. biological clock. e. pituitary gland
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Organic molecules consisting of only hydrogen and carbon are called:
A) carbohydrates. B) hydroxyls. C) hydrocarbons. D) fats. E) carbonic hydrides
Biology & Microbiology