Movement of molecules against the concentration gradient is?
Correct answer: B. Active transport
- A. Passive transport
- B. Active transport
- C. Facilitated diffusion
- D. Filtration
Explanation
Active transport requires the expenditure of energy in the form of ATP to move molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration. This process is performed by specific transport proteins embedded in the cell membrane.
This question appeared on the UHS MDCAT 2022 paper, which you can sit online with every answer explained.
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About Animal and Plant Cell
Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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