Drexel University

Signal Transduction & Transport Mechanisms/ Week #2 (NURS 534) Questions with Complete Solutions

increase dsp (A term) - correct answers A term increases increase dsp (B term) - correct answers B term unchanged increase dsp (Cs term) - correct answers Cs term increases increase dsp (Cm term) - correct answers Cm term unchanged OTC resolution - correct answers higher OTC analysis time - correct answers shorter OTC sensitivity - correct answers higher OTC sample capacity - correct answers lower increase dsp (plate height) -

What form of bromo blue was soluble in the organic layer? a. Acidic b. Basic c. Both d. Neither - correct answers acidic bc its neutral What form of bromo blue was soluble in the aqueous layer? a. Acidic b. Basic c. Both d. Neither - correct answers basic bc it has charge on it and the aq layer in lab was polar and the basic layer was also polar when looking at the full spectra of the promo blue ranging from ph 5 to 10, the absorbance values converge. What is this point called?...

In _________-_________ chromatography, retention is based n the attraction between solute ions and charged sites bounds to the stationary phase. - correct answers ion-exchange In _________ exchangers, positively charged groups on the stationary phase attract anions - correct answers anion _________ exchangers contain covalently bonds, negatively charged sites that attract cations - correct answers cation _________ are amorphous (noncrystalline) particles of organic materials. - correct ...

Substituents on an aromatic ring can either increase or decrease the reactivity of the ring toward electrophiles. This effect is a result of the balance between - correct answers induction resonance Substituents may withdraw or donate electron density from/to the aromatic ring by induction, which depends on the ______ and/or ______ of the atom or group attached to the ring. - correct answers polarizability electronegativity Match each type of substituent to the correct inductive effect ...

Safety of HBr, Br2, Acetic Acid - correct answers all corrosive Br2 safety/characteristic - correct answers strong oxidizing agent -damage all membranes --volatile Clean up bromine with what? Quench bromine with what? Why does this quench? Why is this the agent we use in this lab? - correct answers Sodium bisulfite --strong reducing agent (counteracts effects of bromine being a strong oxidizing agent)--turns bromine into bromide. We use this agent in this lab b/c the bromine is water so...

Goals of separation - correct answers Recovery of product- catching the desired solute after separation Purity of product- how many and how much of various components Type of Chromatography - correct answers Partioning= liquid SP, liquid or gas MP Adsorption (Chemical sticking)- solid SP, liquid or gas MP Ion-Exchange- bonded anion(-) or action (+) SP, liquid MP Molecular Exclusion (size exclusion, gel permeation)-pores SP, liquid MP Affinity- Antigen/Antibody SP, liquid MP Solvent do...

carrier gas - correct answers mobile phase gas in gas chromatography cold trapping - correct answers splitless gas chromatography injection technique in which solute is condensed far below its boiling point in narrow band at the start of the column electron capture detector - correct answers gas chromatography detector that is particularly sensitive to compounds with halogen atoms, nitro groups, and other groups with high electron affinity flame ionization detector - correct answers A g...

NaH - correct answers SB/WN BDN - correct answers SB/WN DBU - correct answers SB/WN -OtBu - correct answers SB/WN (Bulky base) OH- - correct answers SB/SN

When are you allowed to enter the lab? (Choose all that apply) - correct answers When it is the official lab start time and your TA has arrived, When you are wearing goggles and a lab coat When must you wear safety goggles in lab? (Choose 1) - correct answers At all times, including when using computers in the instrument room What clothing is NOT allowed to be worn in lab? (Choose all that apply) - correct answers Sandals and other open toed shoes, Shorts Which of the following actions ...