【单选题】以下选项中非法的表达式是
【简答题】The cell walls of red and white blood cells are semipermeable membranes. The concentration of soIute particles in the blood is about 0.6mol·L -1 . What happens to blood cells that are place in pure wa...
【单选题】Cell plates and cell walls are formed in _______.
【判断题】Fungi differ from bacteria in a number of characteristics. The cell walls in fungi are composed of chitin while the cell walls of bacteria are composed of peptidoglycan
【单选题】The cell walls of Gram-positive and Gram-negative bacteria ()
A.
are the sites of spore formation
B.
both contain peptidoglycan
C.
re connected to the cell nucleus by the endoplasmic reticulum
D.
are composed exclusively of proteins
【单选题】Fungi differ from bacteria in a number of characteristics. The cell walls in fungi are composed of ( )while the cell walls of bacteria are composed of peptidoglycan