Answer:
A <u><em>receptor</em></u> is a protein that recognizes and responds to a signal.
Explanation:
A receptor is a protein molecule present on the cells on which the signalling molecules can bind and generate a physiological response. Some receptor molecules can also respond to Sun and light. Each type of cell has specific receptors molecules and hence can respond to specific signals. The receptor molecules hence tend to receive signals for a cell. Molecules such as hormones bind to the receptors.
A Hydrogen has a negative charge of -1 and o is positive and also neutral
Hi the answer you are looking for is option A)
3.13 x 10 ^9
This is because only 1 number is front of the decimal and 2 numbers should be after
Pretty sure the answer is A
