A ladder of 5000, 3000, 2000, 1000 and 500 bp runs 10.2, 13.3, 15.8, 20.0 and 24.2 mm from the well…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A ladder of , , , and bp runs , , , and mm from the well. A straight line fits against the distance: . A student reads two unknown bands, at mm and at mm.
- What is the size of the band at mm?
- What is the size of the band at mm?
- Is a band at mm safe to read from this ladder?
Need a reminder? The key ideaShow
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. The line .
Plan. Find the log of the size, and then the size.
Step 1. (a) . The size is bp.
Step 2. (b) . The size is bp.
Step 3. (c) The ladder runs from to mm. A band at mm is beyond the smallest ladder band, so the line is not tested there. The reading would be a guess.
Answer: bp; bp; no, mm lies outside the ladder.
Check. mm lies between the bp band at mm and the bp band at mm, and lies between and .
Discussion (0)
Log in to join the discussion.
Loading…