A Coulter counter is:

a. a statistical estimation using 15 dilution tubes and a table of numbers to estimate the number of bacteria per mL
b. an indirect method of counting organisms
c. a device that directly counts microbes as they pass through a tube in front of an electronic detector
d. a device that directly counts microbes that are differentially stained with fluorescent dyes


Answer: c. a device that directly counts microbes as they pass through a tube in front of an electronic detector

Biology & Microbiology

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If you were developing artificial B-cell receptors (BCRs) based on the natural version and wanted to change the BCRs' ability to bind certain antigens, which region of the natural receptor would you alter?

A) transmembrane domain B) amino terminus of light and heavy chains C) carboxy terminus of light and heavy chains D) the region projecting into the cytosol of the cell

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A branch of genomics that generates three-dimensional structures from their amino acid sequences is known as _____

a. bioinformatics b. comparative genomics c. structural genomics d. pharmacogenomics e. proteomics

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The structures illustrated in the figure are

found in the a. mouth. b. esophagus. c. stomach. d. small intestine. e. colon.

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Bioremediation uses microbes to

A.) break down food B.) clean up pollutants C.) convert atmospheric nitrogen D.) produce carbohydrates

Biology & Microbiology