All the biological macromolecules contain carbon, hydrogen and oxygen. however, most do not contain nitrogen. the category that contains nitrogen are:
a. lipids
b. proteins
c. carbohydrates
d. unsaturated fats.

b. Proteins

Explanation:

Amino acids are the substances that are bonded together in a specific sequence to make the polypeptide chains of proteins. All the 20 standard amino acids share a basic structure. All of them have a central carbon atom to which four functional groups are bonded. Three functional groups are common to all these amino acids. These common groups are carboxylic group, amino group (NH2) and a hydrogen atom. Therefore, all the proteins have "N" atoms in their structure. The last functional group is called the "side chain" that varies among different amino acids.

answer: a) a compound microscope has a greater magnification ability than a simple microscope.

explanation:

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