Facilitated diffusion through a carrier protein involves transport by

Question

BlackTom AI · Accepted Answer

Question restatement: Facilitated diffusion through a carrier protein involves transport by

Option 1: 'Creating an opening which molecules can diffuse through along its concentration gradient' — This describes simple diffusion through a pore or channel, not facilitated diffusion where a carrier undergoes conformational change. It implies a static opening rather than a carrier-mediated process, so this is incorrect.

Option 2: 'Using energy to pump molecules against its concentration gradient' — This characterizes active transport, which uses energy (often ATP or a proton motive force) to move substances uphill. Facilitated diffusion does not require energy input and moves substances down their gradient, so this is incorrect.

Option 3: 'Using changes to protein shape to bring molecules across the membrane down its concentration gradient' — This accurately captures the mechanism of facilitated diffusion via a carrier protein: substrate binds, the protein changes shape, and the molecule moves down its gradient without energy expenditure. This aligns with the core concept of carrier-mediated facilitated diffusion.

Option 4: 'Creating a vesicle to carry large amounts of molecules across the membrane' — This describes vesicular transport (such as endocytosis or exocytosis), which is a bulk transport mechanism and not carrier-facilitated diffusion. Therefore, this is incorrect.

In summary, the incorrect statements either describe passive diffusion without carrier involvement, active transport requiring energy, or vesicle-based bulk transport, while the correct mechanism involves carrier proteins changing shape to move molecules down their concentration gradient without direct energy use.

Facilitated diffusion through a carrier protein involves transport by单项选择题

类似问题

Glucose (circles) needs to enter the cell for energy. Based on the diagram, how is glucose going to cross the membrane?

Question at position 31 If the outside of the cell has low solute concentration and the inside of the cell has high concentration, which way would the solute move through a passive protein channel?into the cellout of the cellthere would be no solute movement

Facilitated diffusion

Depolarization of a muscle cell or neuron is due to the transport of Na+ ions through ligand- and voltage-gated Na+ channels. This is an example of what type of transport?

Which of the following statements about facilitated diffusion is INCORRECT:

When a nutrient moves, with the help of a carrier, from an area of higher nutrient concentration into an absorptive cell where the concentration of that nutrientis lower, this is called

When a nutrient moves, with the help of a carrier, from an area of higher nutrient concentration into an absorptive cell where the concentration of that nutrientis lower, this is called

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单