To Prepare 500

question 4

Multiple Choice

To prepare 500. mL of 0.5 M NaCl from a stock of 2.0 M NaCl one needs to ________.

• A) dilute 125 mL 2.0 M NaCl with enough water to a total of 500. mL solution
• B) dilute 125 mL 2.0 M NaCl with 500. mL water
• C) dilute 375 mL 2.0 M NaCl with enough water to a total of 500. mL solution
• D) dilute 375 mL 2.0 M NaCl with 500. mL water

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Definitions:

Mycoplasma

A genus of bacteria that lack a cell wall, making them resistant to many common antibiotics and causing various diseases in humans and animals.

Peptidoglycan

A polymer that makes up the cell walls of most bacteria, consisting of sugars and amino acids, and provides structural strength to the bacterial cell wall.

Cell Walls

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

Cyanobacteria

Photosynthetic bacteria that produce oxygen as a by-product, playing a key role in the early oxygenation of the Earth's atmosphere.