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?

(a)  

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)  

a molecule that contains both acidic and basic groups

(a)  

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 (a)   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