Nucleus: Contains the DNA/ Human genome in the form of chromosomes (with the help of histone proteins), within a nuclear membrane which is inpenetrable by cytosolic enzymes.
Golgi Apparatus: Transport/ modification/ packaging of proteins and lipids.
Lysosomes: Contain enzymes that break down biological polymers such as nucleic acids, carbohydrates and proteins.
Ribosomes: During translation, ribosomes attach to mRNA molecules and decode the sequence by aligning them with complementary tRNA molecules. Each tRNA molecule holds a specific amino acid and as they line up, peptide bonds form between adjacent amino acids, forming the desired protein product. However, the protein can then be post-translationally modified by phopshorylation, methylation or enzymatic cleavage to form the final functional protein.
Mitochondria: Generate energy in the form of ATP (Adenosine Triphosphate) by the breakdown of sugars and fats, this process occurs via the citric acid cycle.
Cell membrane/ Phospholipid Bilayer: Signalling (hormones/ neurotransmitters/ secondary messengers such as cAMP, endocrine/ autocrine/ paracrine), structure of cell, recognition of pathogens, markers of 'self proteins' to immune cells, organisation of components for a particular cell type/ function, etc.