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New videos from Khan Academy 2019-03-20T18:54:43.186845
Mis à jour : il y a 2 heures 18 min

ATP Synthase

mer, 2019-03-20 18:54
ATP Synthase and its role in mitochondria during respiration and chloroplasts during photosynthesis.

Impact of changes to trophic pyramids

mer, 2019-03-20 18:54
Impact of changes to trophic pyramids

Enzyme reaction velocity and pH

mer, 2019-03-20 18:54
Exploring the relationship between pH and enzyme activity.

Cellular evidence of common ancestry

mer, 2019-03-20 18:54
What cellular evidence do we have to construct evolutionary trees and believe that all life on Earth shares a common ancestry?

Simpson's index of diversity

mer, 2019-03-20 18:54
How Simpson's index of diversity can be used to quantify diversity of a community.

Photosynthesis evolution

mer, 2019-03-20 18:54
How and where photosynthesis evolved in the ancestors of cyanobacteria (along with a discussion of endosymbiosis).

Endosymbiosis theory

mer, 2019-03-20 18:54
The theory of how mitochondria, chloroplasts and other membrane-bound organelles in eukaryotic cell likely arose from a symbiosis between aerobic prokaryotes and host anaerobic eukaryotic ancestors. Developed by Lynn Margulis.

Artificial selection and domestication

mer, 2019-03-20 18:54
How humans have shaped plants and animals through artificial selection and domestication.

Logistic growth versus exponential growth

mer, 2019-03-20 18:54
Logistic growth versus exponential growth (for familiarity with A.P. Biology formula sheet).

Water potential example

mer, 2019-03-20 18:54
Example calculating the water potential of potato squares based on placing them in various concentrations of sucrose solutions.

Activation and inhibition of signal transduction pathways

mer, 2019-03-20 18:54
Using the signal transduction pathway for the cholera toxin to understand activation and inhibition.

Surface area to volume ratio of cells

mer, 2019-03-20 18:54
Seeing that the surface area to volume ratio of cells generally decreases as cells get larger, making the exchange of resources, waster and heat more and more difficult.

Molecular variation

mer, 2019-03-20 18:54
How molecular variation in cells helps organisms adapt in different environments and stages of development.

Importance of water for life

mer, 2019-03-20 18:54
Discussion of the properties of water that make it essential to life as we know it: polarity, "universal" solvent, high heat capacity, high heat of vaporization, cohesion, adhesion and lower density when frozen.

Mutation as a source of variation

mer, 2019-03-20 18:54
Mutation in genotype as a source of variation in phenotype

Population growth rate based on birth and death rates

mer, 2019-03-20 18:54
Seeing that the formula for population growth rate based on birth and death rates given in A.P. Biology exams is actually quite intuitive.

Elemental building blocks of biological molecules

mer, 2019-03-20 18:54
Common elemental building blocks of biological molecules: Carbon, Oxygen, Hydrogen, Nitrogen and Phosphorous

Phenotype plasticity

mer, 2019-03-20 18:54
Understanding how the same genotype can still result in variation of phenotype based on environment.

Solved example - Calculating power & heat dissipated

lun, 2019-03-18 07:42
Let's solve some numerical on electric power and heat dissipated.

Horace Pippin's Mr. Prejudice

sam, 2019-03-09 20:07
Horace Pippin, Mr. Prejudice, 1943, oil on canvas, 46 x 35.9 cm (Philadelphia Museum of Art). A conversation with Dr. Jessica T. Smith, Susan Gray Detweiler Curator of American Art and Manager, Center for American Art at the Philadelphia Museum of Art and Dr. Steven Zucker


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