Active transport, diffusion and osmosis are described below. 1 the movement of ions or molecules across the cell membrane against a concentration gradient using energy 2 the movement of ions or molecules from a region of high concentration to a region of low concentration down a concentration gradient 3 the movement of water molecules from a region of their higher concentration to a region of their lower concentration through a partially permeable membrane What links the descriptions with their names?

Which of the following have both cytoplasm and cell walls?

Plant cells are placed in a solution with a lower water potential than that of the cells. Which row is correct?

Using the key, which organism is a virus? 1 has a cell wall go to 2 does not have a cell wall go to 3 2 cell wall is …

In fruit flies, the allele for an ebony coloured body is recessive to the allele for a grey coloured body. In an inve…

Which statement about dominant and recessive alleles is not correct?

What is the effect of a lack of nitrate ions on plant leaves?