This document contains practice biology questions about magnification and measurements of biological structures and cells. It includes images of a fish gill magnified 400x and asks the actual length of a filament. It also includes an image of a parasite spine magnified 1000x and asks the actual length. Finally, it includes drawings of a pancreatic cell measured at 8.6 micrometers and E. coli cells typically 2 micrometers long, asking the magnification of the images.

1. AS Biology AS Biology
Practice Questions Practice Questions
This is an image of the spines on a parasite magnified x1000. What is
This is an image of a fish gill magnified x400. What is the size of an actual
the actual length of one of these spines? Show your working out and
filament on a fish gill. Show your working out and use appropriate units
use appropriate units.

2. AS Biology
AS Biology
Practice Questions
Practice Questions
This is a drawing
of a cell from the
pancreas. The
actual distance of
the cell from A to
B is 8.6
micrometres.
How many times
magnified is this
image?
Show your
working out
This is an image of e.coli cells. They are typically two
micrometres long. Roughly how many times magnified do
they appear in this image?