Overview of gene regulation in the Lac operon. Discussion of CAP, cAMP, lac repressor and allolactose in regulation of lac operon.
Lactic acid fermentation. How organisms like lactobacillus convert pyruvic acid to lactic acid and oxidize NADH to NAD+ in the process.
Sal discusses how energy can't be created or destroyed in an isolated system, and works an example of how energy is transformed when a ball falls toward the Earth.
LeBron James asks Sal Khan about which muscles we use when we shoot a basket. Created by Sal Khan and LeBron James.
Sine and cosine look similar, except they are out of phase. When we talk about sine and cosine as a function of time, the difference is called "lead" or "lag". Created by Willy McAllister.
Roles of DNA polymerase, primase, ligase, helicase and topoisomerase in DNA replication. An explanation of leading and lagging strands.
Lenz's Law - seeing that the magnetic field induced by a current induced by a change in magnetic flux (Faraday's Law) counteracts the change in flux.
Lifecycle of Massive Stars. Created by Sal Khan.
How do organisms use different life history strategies to maximize fitness? Learn about different ways that different species allocate energy and other resources between growth, maintenance/survival, and reproduction.
This video presents the structure and functions of ligaments, joints, and tendons. Created by Tracy Kim Kovach.
Introduction to light quality (intensity, color, softness).
Overview of how lights are used.
Linear velocity from the radius and angular velocity for two pumpkin catapults with different arm lengths.
Here we draw a line on a page and use it as a variable resistor in series with a speaker. What relationship do we hear? Does it sound linear? Created by Brit Cruise.
Pamela explains the difference between "local" and "global" variables, a tricky concept in programming.
Pamela shows how to use different logical operators (like && and ||) inside if statements.
Logistic growth versus exponential growth (for familiarity with AP Biology formula sheet).
First we need to get comfortable with higher vs lower resolution details.
Pamela explains how to use loops to iterate through each value in an array.
Learn several techniques for looping through jQuery collections, using both a for loop and a jQuery method.