Protein molecules are composed of long chains of a. dna b. ribosomes c. amino acids d. rna

The correct answer would be C. amino acid.

The protein or polypeptide chain is a polymer of amino acids.  

The amino acids are attached to each other through a peptide bond.

The amino acid sequence of the protein is determined by the nucleotide sequence of the DNA.  

The amino acid sequence determines the folding of the proteins into the three-dimensional structure.

This three-dimensional structure specifies the function of the proteins.

there is no

explanation:

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.