Which of the following is NOT true when using a compound microscope?
a. Always use a coverslip when
performing a wet mount
b. The course adjustment knob should
be used with all objectives
c. Use the scanning objective (4x)
when first viewing specimen
or tissue
d. The condenser concentrates light
on the specimen.

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.