Cadherins and other cell-adhesion molecules that guide cell migration are
A) steroid hormones.
B) glycoproteins.
C) fatty acids.
D) prostacyclins.
E) ribonucleic acids.
Answer: B) glycoproteins.
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Which mechanism allows certain viral pathogens to evade the vertebrate immune system?
A. becoming a symbiont B. becoming nonvirulent C. frequent changing of surface antigens D. becoming metabolically inactive E. becoming a spore
STDs caused by viruses can be effectively treated with antibiotics.
Answer the following statement true (T) or false (F)
Teosinte is a wild grass in Mexico from which corn (maize) was originally domesticated. How might corn that is grown commercially compare to teosinte?
A) Corn is less genetically diverse than teosinte. B) Corn is more genetically diverse than teosinte. C) Corn is a threat to teosinte populations. D) Corn is about as genetically diverse as teosinte.
The function of vertebrae is to?
A. both protect the brain and nerve cord. B. protect the nerve chord only. C. provide attachment points for muscles only. D. protect the brain only. E. both protect the nerve cord and provide attachment points for muscles