Which of the following describes spicules?
a. They are complicated pore openings and passageways found in sponges.
b. They are fibrous skeletal proteins found in sponges.
c. They are needlelike skeletal structures made up of silica or calcium carbonate found in sponges.
d. They are specialized digestive cells found in sponges.
Ans: c. They are needlelike skeletal structures made up of silica or calcium carbonate found in sponges.
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A. Clostridium difficile infection B. Entamoeba infection C. Schistosomiasis D. Shigella infection E. Ascaris lumbricoides infection
Three levels of structure
What will be an ideal response?
Controlled cell death is termed
A. apoptosis. B. metastasis. C. malignancy. D. tumor formation.
The form of DNA that is believed to be most biologically significant is ________
A) D-DNA B) Z-DNA C) E-DNA D) A-DNA E) B-DNA