Biology 1.2.7 Practice Questions with correct Answers

1.2.7 Practice Kanishka Harnwal 1. Dimensions for cells of various shapes are provided in the table below. Using this information, rank the cells in order from fastest to slowest at procuring nutrients by diffusion from the surrounding medium. Explain your reasoning. Cells ranked from the fastest to the slowest: Sphere shaped cells Cylinder shapes cells Cube shaped cells Reason: We already know that the time it takes for a cell to conduct diffusion depends on the cells surface area. The greater the surface area the faster it takes for diffusion to occur. So after calculating the sphere has the greatest surface area while the cube has the lowest. 2. Draw an illustration of a cell showing the direction of movement in or out of the cell for the following molecules: O2, CO2, urea, glucose, phosphate. How are the molecules taken up by the cell used once inside the cell interior?