Which statement about active transport of bacteria is not right?
A. The gated channel in cytoplasmic membrane involved;
B. The processes require the energy stored in ATP molecules ;
C. The materials move against their electrochemical gradient to cross the membrane;
D. The materials move down its concentration gradient to cross the membrane.
查看答案
Which statement about symports of active transport of bacteria is right?
A. The gated channel will change the structure of transferred molecules.
B. Only one substance is transported at a time.
C. One substance is transported into the cell at the same time that a second substance is transferred out of the cell.
D. Two substances move together in the same direction across the membrane by means of a single carrier protein.
A cell may allow a large or charged chemical to move across thecytoplasmic membrane, down the chemical’s electrical and chemicalgradients, in a process called _______________.
A. active transport
B. facilitated diffusion
C. Endocytosis
D. pinocytosis
Which of the following is most associated with facilitated diffusion?
A. Symports
B. antiports
C. carrier proteins;
D. endocytosis
内分泌系统是指分散在体内各个部位的内分泌腺体和具有内分泌功能细胞的总称。
A. 对
B. 错
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