Humans are able to produce 20 different amino acids, which have side chains with differing properties. How does the variation in amino acids' side chains affect a cell? It allows for a wide variety of proteins to be produced that will carry out a wide variety of functions.
It causes the cell to produce a wider variety of proteins that all carry out the same function within the cell.
It requires the cell to acquire more energy to accommodate a wider variety of chemical bonds among side chains.
It results in individual proteins that can each carry out a wide variety of biochemical processes within the cell.

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carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.