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A ladder 20 feet long is leaning against the wall of a house (see figure). The base of the ladder is pulled away from the wall at a rate of 4 feet per second. Find the rate at which the angle between the ladder and the wall of the house is changing when the base of the ladder is 19 feet from the wall. Round your answer to three decimal places. ​ ​

A man 6 feet tall walks at a rate of 13 feet per second away from a light that is 15 feet above the ground (see figure). When he is 5 feet from the base of the light, at what rate is the length of his shadow changing? ​ ​

You are staining a Gram-negative bacterium and forgot the decolorization step (but continued with the rest of the procedure). What result do you expect at the end of the Gram stain?

Archaea are in a separate domain from bacteria.  Why?

These helminths can be found in raw beef and can be diagnosed by proglottids.

Which of the following was not developed during the Golden Age of Microbiology?

This substance made during fermentation gives plain yogurt its tart taste.

You are staining a Gram-negative bacterium and forgot the safranin step (but continued with the rest of the procedure). What result do you expect at the end of the Gram stain?

These cellular structures have stacks of thylakoid membrane sacs that contain photosynthetic pigments. 

Which of the following is a fungal sexual spore made in a sac?