BIOL 123: Introduction To Comparative Virology

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.

Discover the concept of adaptation in this video, where we evaluate four scenarios to determine which represents a heritable trait enhancing an organism's survival in its environment. Learn how the webbed feet of a duck exemplify a true adaptation, enabling it to thrive in its habitat.

Uncover the key roles of the cerebral cortex, from cognition and memory to emotional regulation. Compare its functions to those of the hypothalamus, particularly regarding circadian rhythms. Get the answer to what the cerebral cortex doesn't govern.

Explore the application of parsimony in constructing phylogenetic trees, emphasizing simplicity in scientific explanations and its relation to evolutionary changes. Learn about various options for tree construction and the core concept of choosing the most parsimonious representation

Discover the essential role of the mantle in mollusks, the protective tissue responsible for shell secretion or organ protection. Explore how land snails, clams, and octopuses utilize their mantles for distinct purposes.

Explore the fascinating interaction between electrical energy charge and materials through the lens of an electroscope. Discover how inserting a conductor between its charged foil sheets changes the charge dynamics leading to an attraction between foil and needle. Understand the roles of conductors insulators and charge induction in this intriguing experiment.