An animal with only one opening to take in food and eject waste has a
A. complete digestive tract.
B. incomplete digestive tract.
C. hydrostatic skeleton.
D. coelom.
E. psuedocoelom.
Answer: B. incomplete digestive tract.
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T-cell tolerance induced in the thymus and B-cell tolerance in the bone marrow is called peripheral tolerance.
Answer the following statement true (T) or false (F)
A ribozyme is a molecule of RNA that has catalytic properties.
a. true b. false
Cells of the second line of defense called ________ recognize and kill virus-infected cells
A) basophils B) eosinophils C) macrophages D) NK cells E) dendritic cells
During cell division of coccus-shaped cells, peptidoglycan biosynthesis occurs ________, and in bacillus-shaped cells, it occurs ________
a. in the growing center / in the stretching termini b. in the growing center / throughout the cell walls c. throughout the cell walls / in the growing center d. throughout the cell walls / throughout the cell walls