Question

Which of the following helps to explain the how uptake of specific nutrient ions is regulated?

Group of answer choices

The relationship between the external ion concentration and uptake rate of the ion is fixed.

Direct interactions between cations and anion occurs because they are regulated the same way.

Transport of an ion into the cytoplasm requires it to bind to a carrier in the plasma membrane and the specificity of the carrier varies.

All of the above.

Answer 1

All of the above

The movement of the ions and it's uptake into cell depends on many factors. The specific ions and it's movement is regulated through direct interaction between the concentration that is present externally of the ion and the rate of it's uptake. Whether the ion concentration is high or low, it's movement will depend on the concentration outside and inside. The ions have some charges and hence they are cationic or anionic in nature and when movement of ions take place, it's regulation depends on it's charge, whether it is positive or negative charge. When the ions are transported within the cytoplasm, in order for the movement to take place it requires assistance from other molecules or carriers localized in the plasma membrane. There are different ways ions are transported and especially in case of movement against concentration gradient, it requires molecules or energy for the transport