Answer:
Cell cycle control is an example of a homeostatic mechanism that maintains proper cell function and health. While progressing through the phases of the cell cycle, a large variety of intracellular molecules provide stop and go signals to regulate movement forward to the next phase.
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Cyclins drive the events of the cell cycle by partnering with a family of enzymes called the cyclin-dependent kinases (Cdks). A lone Cdk is inactive, but the binding of a cyclin activates it, making it a functional enzyme and allowing it to modify target proteins.
Answer:
The weight of the plants at the end of the experiment.
Explanation:
Since the experiment was set up to study the growth of the wheat plants, weight is a sign of growth. So at the end of the experiment, the weight of the plant will be compared to the amount of nitrogen added.
If a graph is to be plotted, the amount of nitrogen (independent variable) will be on the x-axis and the weight of the plants (dependent variable) will be on the y-axis.
The amount of sunlight and temperature are not included because the question does not say that they are parameters in the experiment.
Answer:
pressure changes of alternating contraction and relaxation during the cardiac cycle.
Explanation:
Opening and closing of heart valves are regulated by changes in the blood pressure of various heart chambers during the cardiac cycle. During atrial systole, the higher blood pressure in the atria opens both AV valves and forces the blood to enter the ventricles. The semilunar valves are closed. During ventricular systole, the higher blood pressure in the ventricles opens both semilunar valves to allow the blood to enter the pulmonary trunk and aorta. At this time, both the atrioventricular valves are closed.