BIOL 121: General Biology

Learn why lipid-soluble signaling molecules like aldosterone only impact specific target cells. We discuss four theories and reveal that intracellular receptors present only in target cells are the key. This video demystifies the unique mechanism behind aldosterone's selective action.

Explore the relationship between monomers and polymers, focusing on nucleic acids and their building blocks. This video clarifies the distinctions between various biological molecules and their basic units, emphasizing the critical role of nucleotides in nucleic acids.

Explore the definitions of tissue, organ, and organ system. Understand the distinctions and interconnectedness between these components. Get an overview of the human body's eleven major organ systems and their functions.

Explore stromatolites, the oldest indicators of life on Earth formed by microbial actions. Understand their presence in shallow marine environments and their connection to early eukaryotic life.

Unpack the intricate process of sound transduction, from the initial vibrations in the ear to the transformation into neural signals. Learn about the vital roles of cochlea, basilar membrane, and hair cells in deciphering our auditory world. A comprehensive guide to the magic behind our hearing.

Get insights into the role of lysosomes in different cell types. Find out which cell is the ideal choice for studying these powerful digestive organelles and why.