Steroids are?
 lipids with a complex molecular structure
( cholestrol, testerone, oestrogen, progesterone  )

proteins :

• basic unit = amino acids
• build new cells for growth and renew damaged tissues.
• required for? synthesis of enzymes, antibodies, hormones
• forms strutural components such as keratin in skin, collagen in bones and myosin in muscle tissues.
• its an important components of the plasma membrane 
• involved in synthesis of haemogolobin 

nucleic acid :

• macromolecule which store genetic informations in terms of codes.
• basic unit? nucleotides
• Nucleotide consist of 3 components : nitrogenous base, pentose sugar, phosphate group.

two types of nucleic acid :

1. DNA (deoxyribonucleic acid) - double stranded nucleic acid. two strands of polynucleotides twisted around each other) forms? double helix. are usually found in the nucleus. but also can be found in mitichondria and choloroplast
2. RNA (ribonucleic acid) - found in the cytoplasm, ribosomes and nucleus