The guard cell is responsible for controlling the size of the stomata in leaves. These do so as a result of an interaction between potassium ions and water in and around the cells. When potassium ions accumulate inside the guard cells the water potential inside these cells is lower than that of the outside and as a result, water has to be taken in. This makes the guard cells turgid which in turn stretches them and results in the opening of the stomata. Meanwhile, when potassium ions accumulate outside the cell, the opposite scenario results. Water from inside the cell moves out, making the guard cells flaccid, thus causing these to cover (and effectively close) the stomata.
Answer:
True, fasting blood sugar levels are generally higher in the early morning due to the increase hormonal activity during the night, then tend to decrease to more normal levels during the day.
Explanation:
<span>The energy to this reaction can be provided by adding a catalyst enzyme : DNA polymerase. Energy is released when this enzyme cuts off 2 phosphate groups from the end of the nucelotide. This energy is sufficient to link the nucleotide to the DNA.</span>
The answer of the first question is ( b. towards ).
I am not sure about the answer of the second one.
It may be ( a. alive ).
I will confirm it soon.