Which reason best explains why bacteria is good at causing infections in other organisms? a. bacteria have a rigid, protective layer that is called a pili.
b. bacteria are transmitted easily and reproduce quickly.
c. bacteria evolve slowly as they pass on genetic information.
d. bacteria are easily killed by a host’s immune system or antibiotics.

A. Is incorrect, while may add some adhesion factor it is not considered a protective layer they are more like strands or hairs. They are also used in biofilm formation (bacteria stick to one another, and surfaces), phage transduction, DNA uptake, and some special cell movement (called twitching). B. Bacteria are transmitted easily and reproduce quickly. They are very good at colonizing and in so doing makes it harder for the body to fight it off as well as being easily spread which is what gives it very good traits of causing infections. C. This is incorrect they actually evolve pretty quickly, they can even pick up plasmids ( little circle of extra DNA) and take it up and use it. We do this in the lab a lot though they do pick up on their own we force it by electrocuting them which causes tiny pores to open on the bacteria then allow the DNA we want to be shoved in easily. In nature they pick up stuff that would help such as an antibiotic resistance gene. D. While some may be killed easily, the question is asking why they are good at causing infection so this one is incorrect.

I believe the correct answer among the choices listed above is option B. The reason that best explains why bacteria is good at causing infections in other organisms is that bacteria are transmitted easily due to their size and can reproduce quickly. They can double their amount in just minutes.