The Answer is A. The presence of sodium potassium pumps has nothing to do with water moving in and out of cells.
Two weeks before an open- ended road trip
A polypeptide is a chain of amino acids. The completed polypeptide chains come together to form proteins, so be careful not to get them mixed up!
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The right answer is: vitamin C and choline
Choline (vitamin B4) is the precursor on the one hand acetylcholine (important neurotransmitter and neuromodulator) and on the other hand, the cascade initiated by betaine (intermediate in the biological methylation and precursor of membrane lipids). In this, it is considered, by extension, as an integral part of the family of B vitamins,
Vitamin C protects against cellular aging, is essential for the immune defenses and increases the assimilation of iron of plant origin. It also contributes to the formation of collagen. Its deficiency leads to a disease called scurvy (hence the ascorbic acid name of vitamin C).
