Plasma membrane proteins perform a variety of functions: they act preferentially on transport mechanisms, organizing true tunnels that allow substances to pass into and out of the cell, function as membrane receptors, and receive signals from substances that carry some message to the cell, favor adhesion of adjacent cells in a tissue, serve as anchor point for the cytoskeleton.

A new study from the University of Birmingham in the United Kingdom stated that overconfidence in using computers and search engines is weakening people's memories. That is, common sense has just gained scientific backing: using computers instead of memorizing information is leaving us oblivious.

Fermentative processes lead to the formation of small organic molecules, but still capable of releasing energy. For example, ethyl alcohol, one of the products of glucose fermentation, contains reasonable amounts of releasable energy, both used as fuel. Aerobic respiration consists in carrying out the process of degradation of organic molecules, reducing them to virtually no release energy.

In a neuron, the stimuli always propagate in the same direction: they are received by the dendrites, travel through the cell body, travel through the axon and, from its end, are passed to the next cell (dendrite - cell body - axon). The nerve impulse that travels through the neuron is of electrical origin and results from changes in the electrical charges on the outer and inner surfaces of the cell membrane.

In our relationship with the world, we are stimulated all the time and respond to the elements of the environment. With each external stimulus (such as the smell of food or the sound of a horn) and even internal stimulus (such as pain or hunger), the organism reacts, that is, in a way “answers these questions: Where does the stimulus?

Sulfur is a yellow substance found in soil that burns easily. It enters the production of sulfuric acid, a substance widely used for fertilizers, dyes and explosives (gunpowder, matchsticks, etc.). Sulfur is found in sedimentary rocks (formed by deposits that have accumulated by the action of nature) in volcanic rocks, coal, natural gas etc.