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Which process allows substances to enter cells against a concentration gradient? A Active transport B Diffusion C Mitosis D Osmosis Your answer - OCR Gateway - GCSE Biology Combined Science - Question 7 - 2021 - Paper 1
Question 7
Which process allows substances to enter cells against a concentration gradient? A Active transport B Diffusion C Mitosis D Osmosis Your answer
Worked Solution & Example Answer:Which process allows substances to enter cells against a concentration gradient? A Active transport B Diffusion C Mitosis D Osmosis Your answer - OCR Gateway - GCSE Biology Combined Science - Question 7 - 2021 - Paper 1
Step 1
Identify the process
Answer
The process that allows substances to enter cells against a concentration gradient is Active Transport. This mechanism utilizes energy, typically in the form of ATP, to move molecules from an area of lower concentration to an area of higher concentration, effectively against the natural flow dictated by diffusion.
Step 2
Explain why other options are incorrect
Answer
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Diffusion: This is a passive process where substances move from an area of higher concentration to an area of lower concentration, thus not applicable for entering cells against a gradient.
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Mitosis: This is the process of cell division, unrelated to the movement of substances across a cell membrane.
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Osmosis: While this is a specific type of passive transport involving water molecules moving through a semipermeable membrane, it also does not involve movement against a concentration gradient.