Which of the following is a correct procedure for the operation of a microscope?
A.
First, put the specimen into focus using a low power lens, then switch to a higher power lens, if needed.
B.
Remove and add slides while the high power lens is selected.
C.
Use the fine focus knob with the low power lens and use the coarse focus knob with the high power lens.
D.
First, put the specimen into focus using a high power lens, then switch to a lower power lens, if needed.

Part a - which gene to compare? in this exercise, you will use the cytochrome c oxidase i (coi) gene to investigate relationships among salmon species. (this gene encodes a protein that functions in the mitochondrial electron transport chain.) you will compare the coi gene sequences from your salmon test samples to the standard sequences for each salmon species. in order for the coi gene to be useful for distinguishing among the different salmon species, which three statements must be true?