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Scientists are testing substance L to determine how it enters mammalian cells in a culture. The cells maintain a 120 millimolar (mM) intracellular concentration of substance L . The scientists determined the rate of entry of substance L into the cells at various external concentrations of substance L (10 to 100 mM) in culture medium (Table 1).(a) Identify the most likely mode of transport across the membrane for substance L. Explain how information provided helps determine the most likely mode of transport.(b) On the axes provided, construct an appropriately labeled line graph with correct scale and units to illustrate the data in Table 1.The figure presents a grid with 10 by 10 axes.(c) Determine the external concentration of substance L that will result in one-half of the maximal entry rate.(d) Predict the likely effect on the ability of substance L to enter the cells if substance L is attached to a large protein instead of free in the culture.

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