Correct answer: (2) make cell structures more visible

Stains are used to help microscope viewers see the different structures of a specimen. Iodine is an example of a stain commonly used in laboratories. Iodine is used as a starch indicator, making structures with starch dark blue in color.

Incorrect answers:

(1) eliminate some organelles

An organelle is one of the several formed bodies with a specific role and suspended in the cytoplasm of eukaryotic cells. Stains are not applied to destroy these organelles because when this happens, the cell viewed on the microscope would be destroyed.

(3) use the high-power lens

No staining agent is needed to use the high-power lens. Just move the nosepiece to move the lens from one objective to another.

(4) remove water from the slide

According to the graph the net change in the carbon dioxide level during the years 1960 through 2000 is 50 ppm

Option 1 – Shorter than bar X and placed to the left of bar X

This interpretation arises from the fact that the value of X is increasing from left to right and vice versa on the x-axis and the relative amount of ATP produced is increasing from bottom to top and vice versa.

Option 4 – injecting 1mL of Drug A into 100 white mice with cancer and 1mL of distilled water into another group of 100 white mice of cancer.