CC LEC EXAM

OSHA uses this law to inspect and accredit lab facilities

• Occupational Safety and Health Administration

• Occupational Safety and Health Act

paper chromatography is an example of

• liquid-liquid chromatography

• solid-liquid chromatograpy

• gas-liquid chromatography

• gas-solid chromatography

You are given a series of 5 tubes, each of which contains 5ml of diluent. 2ml of serum is added to the first and second tubes, and a serial dilution using 1 ml is carried out in the remaining tubes. What is the serum concentration in tube 5?

type of buffer used when the

- pH level is around 8.0 pH

- for nucleic acid separation

- has high resolution

- has high buffering capacity

• Tris-borate-EDTA buffer (TBE)

• Tris-glycine buffer

• Tris-acetate-EDTA buffer (TAE)

• Barbitone buffer

Make 500 grams of 40% w/w aqueous solution of sodium chloride

a molecule that contains both acidic and basic groups

In an experiment, Seth used an ion-selective electrode with no dilution of sample. What type of ISE electrode is used?

• Direct ISE

• Indirect ISE

• Both Direct and Indirect ISE

• None of the choices

a pH electrode contained within a plastic jacket with sodium buffer and permeable membrane

• pH electrode

• calomel electrode

• severinghaus stow electrode

• normal hydrogen electrode

liquid junction or also known as ___ is required to complete the circuit between the reference and without contaminating anything

under potentiometry, it is an electrode that produces constant potential

• Indicator Electrode

• Reference Electrode

• Potential Electrode

• pH electrode