Written by Irene Chang Given: At STP, gaseous O molecules are placed in a rigid 22.4 L flask at 1 atm and 25.0 Celsius. a.     How many moles of O2 are in the flask? b.     If all the oxygen molecules were to react and form O2, what would be the resulting pressure? Which    ...

Written by Merel Dagher (PEACE Advisor) Which of the following is the basal member of Archaeplastida? a.     Glaucophytes b.     Red Algae c.     Chlorophytes d.     “Charophytes” e.     Land PlantsClick “Read More” to see the answer.  The correct answer is a. Both Chlorophytes and “Charophytes” belong to the informal group Green Algae. “Charophytes” are semi-terrestrial, making...

Written by Merel Dagher (PEACE Advisor)  How might we isolate cytosolic proteins from tissues, in order to purify them? a.     centrifuge the tissue at low speed; the protein is in the pellet b.     centrifuge the tissue at medium speed; the protein is in the pellet c.     centrifuge the tissue at high speed; the protein...

Written by Merel Dagher (PEACE Advisor)  Compare and contract the lifecycle of Brown Algae (a Chromalveolata) and Ulva (a type of “green algae”): a.     Only brown algae have a haplodiplontic life cycle b.     Both have a haplontic life cycle c.     Ulva has isomorphic gametophytes and sporophytes d.     Brown algae have isomorphic gametophytes and sporophytes e.     Ulva...

Written by Merel Dagher (PEACE Advisor)  After we get our desired proteins, how can we test to see if the protein we want to purify is in the sample of proteins? (More than one answer choice may be correct)  a.     perform a colorimetric assay b.     perform a radiochemical assay c.     perform an immunological assay...

Written by Merel Dagher (PEACE Advisor)  Which of the following belong to the kingdom Chromalveolata? Select all that apply. a.     Dinoflagellates b.     Oomycetes c.     Ciliates d.     Diatoms e.     Brown Algae f.      All of the above.  The correct answer is F. All of the following belong to the Chromalveolata kingdom. Dinoflagellates (responsible for...

Written by Merel Dagher (PEACE Advisor)  Determine the sequence of this hexapeptide: L, K, G, M, S, P. Follow the sequence of clues mentioned below to determine the sequence.  a.     First, I use Sanger Sequencing to get a change from FDNB to P-DNB b.     Second, I cleaved with Trypsin to get a dipeptide of...

Written by Merel Dagher (PEACE Advisor)  How can bacteria transfer genes across members of their generation? a.     Transformation b.     Transduction c.     Conjugation d.     All of the above e.     Only b and c Click “Read More” to see the answer.  The correct answer is d. Transformation is the transfer of genes through the environment; transduction...

Written by Prerak Juthani (PEACE Advisor)  In the reaction shown below, which reactant acts as the nucleophile and which as the electrophile? a.     The aldehyde is nucleophilic; it will attack the alcohol b.     the aldehyde is electrophilic; it will attack the alcohol c.     the alcohol is nucleophilic; it will attack the aldehyde d.     the...

Written by Merel Dagher  How can enzymes lower the energy of activation of a reaction? a. There is an entropy loss when the substrates are bound to active sites because the water molecules that had originally surrounded the substrates are displaced. b. When the substrates are bound at the active sites, there is a decrease in...