3.1 Organic Molecules
Organic molecules contain carbon and hydrogen atoms bonded to other atoms.
1. Four types of organic molecules (biomolecules) exist in organisms: carbohydrates, lipids, proteins, and nucleic acids.
Organic molecules are a diverse
5.1 Membrane Models
In the early 1900s, researchers noted that lipid-soluble molecules entered cells more rap idly than water-soluble molecules, suggesting lipids are component of plasma membrane.
Later, chemical analysis revealed that the membrane