Proteins are made from amino acids. An amino acid has three parts that are joined to a central carbon atom. Identify the three parts that create an amino acid. amino group fatty acid carboxyl group R group C group A chain of 2 carbon atoms and a nitrogen atom is shown. The middle carbon atom is bonded to a hydrogen atom and an R group. The other carbon atom is double-bonded to an oxygen atom and single-bonded to a hydroxyl group. The nitrogen atom is bonded to 2 hydrogen atoms.

amino group, fatty acid carboxyl group and R group.

Explanation:

The three parts from which amino acid is formed are the amino group, carboxyle group and R group. These amino acids are the building block of proteins. There are certain foods which contain proteins such as meat and pulses etc. When these foods are eaten, the protein broken down into amino acid with the help of enzymes and absorbed by the cells for building of muscles and other substances in our body.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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