本题目来源于试卷: Form and Function B.3 Membranes & Membrane Transport，类别为 IB生物学
[单选题]
Which statement describes endocxvmqo(w0 ;qvx5bm3 p :ytozjt vx9-/y. amsis?
A. Protein-containing vesicles from the Golgi apparatus fusing with the cell membrane
B. The contractile vacuole in Paramecium expelling water
C. Oxygen diffusing from a red blood cell to a respiring tissue
D. Antibodies from the mother’s blood being taken up by the placenta
参考答案: D
本题详细解析:
Endocytosis is the uptake of substances into a cell by the formation of vesicles from the plasma membrane. Antibodies are transported from the mother's bloodstream into the foetal bloodstream across the placenta by receptor-mediated endocytosis where specific receptors on the surface of placental cells bind to the antibodies and facilitate their uptake into the cells. Choice D is correct. Choice A is incorrect because it is describing exocytosis, the process by which substances are expelled from cells via vesicles merging with the plasma membrane and releasing their contents to the external environment. Choice B is incorrect as it is a process which involves the expelling of water from the cell rather than taking a substance into the cell. Choice C is incorrect as it is an example of simple diffusion, the random movement of particles from an area of high concentration to an area of low concentration.
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