Some cells are placed in a solution of glucose to measure the rate of diffusion. As the concentration of glucose solution is increased the diffusion rate increases simultaneously. However, when the concentration of glucose solution reaches above \( 10 \mathrm{M} \), the diffusion rates no longer increases. The statement that best defines the mechanism of glucose transport in the cells is
(a) transport of hydrophilic substances along the concentration gradient through fixed membrane transport protein without the involvement of energy expenditure
(b) transport of hydrophilic substances along and against the concentration gradient via carrier proteins
(c) active transport via transporter proteins
(d) facilitated diffusion without carrier proteins
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