A species is a group of closely related organisms capable of interbreeding and producing fertile offspring, and speciation is the evolutionary process by which new species arise. Speciation can occur through anagenesis (gradual...

Symbiosis is a close and evolved interaction between species, which can be obligate (necessary for survival) or facultative (optional). It includes various types: mutualism (both benefit), commensalism (one benefits, the other is...

Isoelectric focusing (IEF) is a high-resolution technique for separating proteins based on their isoelectric points, utilizing electric fields to focus molecules into sharp zones within a pH gradient. The pH gradient, created using...

Proteins, composed of amphoteric amino acids, can carry different net charges depending on the pH of their environment. The pH at which a protein has no net charge is called its isoelectric point (pI), and this varies between proteins...

SDS–PAGE is a widely used technique for qualitative analysis of protein mixtures, particularly during protein purification. Proteins are denatured using SDS and β-mercaptoethanol, which linearize the molecules and impart a uniform...

COVID-19, caused by the novel coronavirus SARS-CoV-2, emerged in China and rapidly escalated into a global pandemic, as declared by the WHO on March 11, 2020. While most patients recover, the disease poses higher risks for the elderly...

In 2017, a swine flu outbreak in Maryland demonstrated how viruses can jump from animals to humans, potentially sparking epidemics. Host jumps occur when a virus mutates just enough to infect a new species, evade its immune system, and...

Ames test was developed by Bruce N. Ames in 1970s to test for determining if the chemical is mutagens. Ames test it is a biological assay to assess the mutagenic potential of chemical compounds. It utilizes bacteria to test whether a...

Unlike SDS–PAGE, which denatures proteins, native or buffer gels maintain proteins in their functional state, allowing detection of enzymes based on biological activity. Proteins are separated by their native charge and size, and enzyme...

Two-dimensional polyacrylamide gel electrophoresis (2-D PAGE or 2-DE) is a powerful technique used in proteomics to separate complex protein mixtures based on two properties: isoelectric point (via isoelectric focusing) and molecular...

The 1943 Luria–Delbrück experiment, known as the "Fluctuation Test," demonstrated that mutations in bacteria occur randomly rather than as a directed response to environmental stress, such as viral infection. By showing wide variation in...

An amphoteric species, like water, can act as both an acid and a base depending on the chemical environment, as described by Brønsted-Lowry Theory. Water accepts a proton to act as a base (e.g., with HCl) and donates a proton to act as...

Polyacrylamide gel electrophoresis (PAGE) uses a gel matrix formed by polymerizing acrylamide and bis-acrylamide through free radicals generated by TEMED and APS. This exothermic polymerization forms linear chains cross-linked into a 3D...

A gradient gel features a continuous change in acrylamide concentration (e.g., from 5% to 25%), resulting in decreasing pore size from top to bottom. This allows separation of a broader range of protein molecular weights and improved...

Explanation of Net Promoter Score

Find out how a combine harvester separates grains from chaff using sieves.
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Learning Points
The size of the mesh in a sieve...

“Surface Area” will show the proper methods of acquiring the surface areas of different shapes.

This problem is about using Newton's 2nd Law to determine the acceleration of a block being pulled at an angle on a level surface.

This problem is about using the Right Hand Rule to determine the Net Magnetic Force on a current carrying loop near a Bar Magnet.

This problem is about the net torque on a cylinder with multiple radii.

This problem is about using the derivative and Netwon's 2nd Law to determine the time at which the net force on an object is zero.

This problem is about the average net torque on a wheel when we know the change in its angular speed, moment of inertia and change in time.

This problem is about the equation for the net torque on an cylinder with two radii in static equilibrium.

This problem is about finding the coefficient of kinetic friction for a block being pulled at an angle relative to a level surface.