Question

HELP PLEASE
A pathogenic strain of bacteria has become resistant to an antibiotic that once could kill it. What has happened to these bacteria to make this happen?
-Most of the bacteria make changes to their DNA to protect themselves, making themselves immune to future attacks.
-Only the few bacteria that were immune to the antibiotic survived and reproduced, making all their offspring immune to it as well.
-Some of the bacterial cells were able to produce toxins against the antibiotics, making them more likely to survive.
-The bacterial cells learned to remove the receptors on their cell surfaces,

Answer 1

Use process of elimination. Bacteria can't make conscious decisions about their behavior or learn to do new things, so that leaves one option...

Answer 2

Thanks, I have another question If an amoeba manages to engulf a bacterium using endocytosis, what is most likely to happen to the bacterium?
-It will be digested by the amoeba and used as a food source.
-It will be ejected by the amoeba through an opening in the cell membrane.
-It will infect the amoeba and eventually kill it.
-It will insert some of its genes into the genome of the amoeba.

Answer 3

It is helpful if you post different questions in different threads. Simply for organizational purposes.

In this case, you should use process of elimination again. Amoeba plainly can't have openings in their cell membranes or everything in their cytoplasm would spill out. Similarly, once a bacteria has been endocytized (taken in) to an amoeba it will be dead in shorter order so there is not a lot it can do...

Answer 4

Clear?

Answer 5

Ahhh I see
thanks once again

Answer 6

so, the second is your choice, no?

Answer 7

No, I like the first. For the second question.