Answer: Adenine, Guanine, Thymine or Uracil and Cytosine
Explanation: Nitrogenous bases are one of the major constituents of nucleic acids. They contain nitrogen and act as bases in reactions.
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Answer:
Acetylcholinesterase enzyme inhibitors are limiting the hydrolysis process of the neurotransmitter acetylcholine, increasing its availability and interaction with specific receptors.
Explanation:
Acetylcholine is a neurotransmitter that aims to stimulate or inhibit the activity of a tissue, by stimulating nicotinic and muscarinic receptors. An example of this is the action of acetylcholine on nicotinic receptors present in the muscle, which promote muscle contraction.
Acetylcholinesterase is responsible for hydrolyzing acetylcholine to make the effect on a receptor end.
In degenerative diseases of the nervous system -such as Alzheimer's- the activity of acetylcholine decreases, so reversible acetylcholinesterase inhibitors are used to limit the neurotransmitter hydrolysis process, increase its bioavailability, and allow the effect of acetylcholine on muscarinic brain receptors.
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<span>Cell membranes protect the cells that is why they are called the gatekeepers of the cell. A cell membrane can be internal or external like that of the case of eukaryotic cells with internal cell membrane. It is mostly made up of glycerophospholipids. This compound like other lipids is also soluble in water however, their unique geometry allows them to aggregate into bilayers without too much energy input. Cholesterol can also be found in the cell membranes however, it is not as abundant as the glycerophospholipids.</span>
Vitamin A
a would be the answer
