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On a tripartite theory of knowledge, having propositional knowledge consists in having a justified, true belief that a certain proposition obtains. For example, to know that it will rain tomorrow consists...

Let y = f(x). The gradient of the tangent to the curve at a stationary point is equal to 0. To find an equation for the gradient of the curve, differentiate f(x) to get dy/dx. Because we are looking for s...

Second messengers are used in the downstream signalling cascade of protein hormones. As these hormones are hydrophilic, they can't cross the phospholipid bilayer. Therefore, when binding to a specific rec...