Question

HELLO)

there was a question that 

31. Choose false answer about proteins
A. there are anion
B. they are cation
C. they present in ECF mainly in plasma
D. they are present with low concentration in interstitial fluid
E. concentration of protein inside cells is more than the outside of the cells

 

i dont understand in cites there is written that prteins can be anions and cations then why this tests answers shows that answer is b 

thankfor your attetion ;sorry to bother you

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