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tRNA suppressor mutation to transcribe nonsense mutations

Okay, so I know this might be a bit hyperspecific, but I don't know where else to ask it. I'm working through a microbiology lecture, and the professor says the the B strain of E. coli has a tRNA suppressor that allows it to transcribe phage genes that have any nonsense mutation. That seemed a bit vague, so I decided to look it...

Wall framing question: stud spacing between openings

I'm framing up a non-load-bearing wall that has two closet doors on it, close together (the king studs for the two openings are 13" apart). Unfortunately, they are aligned such that one of the 16" OC common studs would fall within that gap. In fact, it would only be 1/2" away from the left king stud, so not even anywhere near...

How often do I actually need my heat pump system tuned up?

I had a heat pump installed about a year ago. It came with one free service and the installing company has been calling me almost every week to come out and do the complimentary tune up. I know that I obviously should take a free tune up, but it made me wonder. How often do I actually need this done? What are they actually...

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