25 ML of a Growth Medium Containing Bacteria at a Concentration

question 1

Multiple Choice

25 mL of a growth medium containing bacteria at a concentration of 3  10⁵ cells per litre is diluted to a volume of 0.05 L. What is the concentration of bacteria after dilution?

• A) 1.5  10⁶ cells L^-1
• B) 1.75  10⁸ cells L^-1
• C) 6.7  10^-6 cells L^-1
• D) 6  10⁵ cells L^-1
• E) 1.5  10⁵ cells L^-1

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Definitions:

Sulfa Drugs

A group of synthetic antibacterial agents that contain the sulfonamide group and are used to treat bacterial infections.

Folic Acid

A B-vitamin that is essential in cell growth and development, critical for pregnant women to prevent neural tube defects in the fetus.

Cell Walls

Rigid or semi-rigid structures surrounding the cell membrane of plants, fungi, and certain bacteria, providing support and protection.

Organic Chemicals

Compounds mainly composed of carbon atoms, along with hydrogen, oxygen, nitrogen, and other elements, found in living organisms.