Question

1)

Given a coccus bacterium with a radius of 0.85 micrometers, what is its surface area to volume ratio, assuming it has perfect geometry?

Report your answer as a decimal, for example a surface area of 1 μm² with a volume of 3 μm³ would would yield SA / V = 0.67 μm^-1. Do not include units when reporting your answer.

The formula for the volume of a sphere in the lab manual is incorrect. Here are the formulas for the surface areas and volumes of spheres and cylinders.

SHAPE SURFACE AREA VOLUME

sphere 4pi r^2 3/4pi r^2   

cylinder 2pi rh + 2pi r^2 pi r^2h

2)

In the Gram stain procedure, if the decolorizer step is not performed, the primary stain crystal violet will

		stain only the thicker peptidogylcan cell walls.
		stain all bacterial cell walls.
		stain only the thinner peptidogylcan cell walls.
		stain the glass around the cell walls.

Answer 1