A nuclear<span> reactor </span>produces<span> and controls the release of </span>energy<span> from splitting the atoms of uranium. Uranium-fuelled </span>nuclear power<span> is a clean and efficient way of boiling water to make steam which drives turbine generators.</span>
Answer: A. True
Explanation: Cell receptors are proteins that receive signals and trigger a signal cascade for the cell can respond. There's many types of receptors, depend of their location and their enzymatic activity, and each type can recognize certain signals. For example, tyrosine-kinase receptors can recognize growth factors, JAK associated receptors can recognize cytokines, etc. That specificity is given by the structure of the receptor and the structure of the signal.
Oxygen
During aeroobic respiration oxigen reacts with sugar or glucose, producing carbon dioxide, water, and energy.
During anaerobic respiration when there is not enough oxygen, cells break down glucose into lactic acid and energy.
A. Pressure receptors in the stomach walls signal fullness or emptiness
