【单选题】The relative proportion (by weight) of lipid and protein in a membrane:
B.
varies depending upon the source of the membrane
C.
is always characterized by more lipid than protein
D.
is always characterized by more protein than lipid
【简答题】结合视频,说出图片中A、B框箭头所指的位置的名称: A所指的是:__________________ B所指的是:__________________
【单选题】《神农本草经》,成书于汉代,是中医四大经典著作之一,是现存最早的( )著作。