What is the molecular mechanism of antibiotic resistance?

Antibiotic-resistant bacteria that are problematic or impossible to treat are becoming increasingly common and are causing a global health catastrophe.

 Antibiotic resistance is determined by several genes, many of which can transfer between bacteria.

New resistance mechanisms are regularly being described, and new genes and vectors of transmission are identified on a regular basis.

This article reviews recent advances in our understanding of the mechanisms by which bacteria are either intrinsically resistant or acquire resistance to antibiotics, including the prevention of access to drug targets, changes in the structure and defense of antibiotic targets and the direct modification or inactivation of antibiotics

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none, its a machine

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.