A marathon is 26.2 miles. How many km is this? 1. apparatus that traps bacterial cells on a membrane filter where they can be counted. 2. a device that counts cells

by measuring the amount of light that passes through a culture. 3. a device that counts cells using an electrical current. 4. a glass side containing an etched grid for counting microbes directly using a microscope.

Fig: 1

Fig: 2