Movement in and out of cells
35 past-paper questions on Movement in and out of cells · examined 2020–2025.
20253 questions
4 Contact lenses are placed on the surface of the eye to correct problems with vision. One type of contact lens is partially permeable and is normally stored in a sterile sodium chloride solution. The sodium chloride solution has the same concentration as the fluid that covers the surface of the eye. A person makes a mistake and stores their contact lenses in distilled water rather than sodium chloride solution. They then place a contact lens on the surface of their eye. Which pair of statements describe what then happens? 1 Water from the eye fluid enters the contact lens by osmosis. 2 Water
5 Which process involves the movement of molecules against a concentration gradient? A active transport B diffusion C osmosis D transpiration
14 Which processes use energy obtained from respiration? 1 contraction of intercostal muscles during breathing 2 nitrate ions entering a root hair cell against the concentration gradient 3 oxygen moving from the lungs into blood capillaries 4 production of antibodies by lymphocytes 5 water entering a bacterial cell by osmosis A 1, 2 and 3 B 1, 2 and 4 C 2, 3 and 4 D 3, 4 and 5
20242 questions
What would happen if this cell is then placed in distilled water?
Which particle can only be moved by active transport between the cells in the direction described?
20233 questions
Why has the starch suspension changed colour?
Complete the column headings in Table 1.1.
For each potato cylinder: remove the potato cylinder from its test-tube, measure its length, record this final length in Table 1.1.
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