Hurry ! which best describes the structure of the molecules that make up proteins?
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a. carbon + hydrogen + oxygen
b. phosphate + sugar ring + nucleotide base
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c. hemoglobin + oxygen + iron
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d. carboxyl group + amino group + side chain

The answer is D!
there is a carboxyl group (COOH) an amino group (NH2) , and a side chain (different elements arranged in different structures. this determines what kind of amino acid it is). this option describes the structure of amino acids

A gives the name of some of the elements found in proteins but not the structure.

B gives the structure for DNA/ RNA

C gives a type of protein and two elements; not a structure

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.