Describe the basic molecular structures and primary functions of the four major categories of biological macromolecules:
a. carbohydrates
b. lipids
c. proteins (amino acids)
d. nucleic acids

Carbohydrates

Explanation:

Carbohydrates get broken down into glucose by the acid in your stomach and small intestine, and the glucose gives energy to your cells especially brain cells and neurons. Lipids like triglycerides store energy for cells. Proteins build up many parts of your body. Carbohydrates like monosaccharides have a formula of C6,H12,O6 and are kind of hexagon shaped. Different lipids have different structures, triglycerides is like three lines because they are made of 3 fatty acids and glycerol. Different proteins have different structures, alanine is lined with oxygen atoms and hydrogen. DNA is two lined with proteins on it and RNA is one lined with proteins.

answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.