Why do bacteriophages only infect bacteria?

Answer 1

Viruses only infect those cells that have a matching protein to the one that is found on the virus' capid.
This protein + protein combination are often referred to a and ship its' docking station.

They have to match or the virus can not enter the host cell and can not infect it.

Bacteriophages (or 'phages) only can infect bacteria for this reason.

Use of 'phages as antibiotics have become a rather interesting idea and maybe they will be the antibiotics of the future.

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Answer 2

Victoria Angeli

Bacteriophages only infect bacteria because they are specifically designed to recognize and attach to receptors on bacterial cell walls. Their structure and mechanisms of infection are tailored to interact with bacterial cells, making them ineffective against other types of cells like those found in animals or plants.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.