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...

Written by Merel Dagher (PEACE Advisor)  Which of the following is not a type of bacteria that can cause disease? a.     Treponema b.     Borrelia c.     Chlamydia d.     Clostridium e.     Tinea corporis Click “Read More” to see the answers.  The correct answer is e. Treponema is a type of bacteria that causes syphilis (an STD)....

Written by Prerak Juthani Which of the following are true, with regards to Myoglobin and Hemoglobin? a.     both have 8 alpha helices and no beta sheets b.     both don’t have a quaternary structure c.     both display cooperativity d.     both have the same affinity for oxygen e.     both have only one heme group Click “Read...

Written by Merel Dagher (PEACE Advisor)  Match the correct scientists to his/her respective invention/discovery. a.     Carl Linnaeus – binomial system of nomenclature b.     Willi Henning – phylogenetic systematics c.     Antonie Van Leeuwenhoek – father of microbiology d.     Beatrix Potter – lichen symbiosis between fungi and algae e.     Lynn Margulis – endosymbiotic theory  f.  ...

Written by Merel Dagher  Which of the following increases the affinity for binding oxygen in hemoglobin? a.     H+ ions increasing b.     CO2 concentration increasing c.     2,3-BPG concentration increasing d.     Stabilization of the T-state e.     exchanging a His for Ser residue in Hb Click “Read More” to see the answer.  The correct answer is e....

Written by Merel Dagher (PEACE Advisor)  Which of the following is incorrect? a.     the “Age of Cycadophyta” is the Mesozoic b.     Gnetum, Ephedra, and Welwitschia are three types of Gnetophytes c.     Palm trees are Cycadophytes d.     Gingko and algae have a symbiotic relationship e.     Pacific Yew (also known as Taxol) comes from conifers  Click...

Written by Merel Dagher (PEACE Advisor)  Which of the following was responsible for initially creating an oxygen-rich environment? a.     cyanobacteria b.     fungi c.     algae d.     protists e.     bryophytes Click “Read More” to see the answer.  The correct answer is a. Thanks to the photosynthetic activity of cyanobacteria, the atmosphere eventually accumulated levels of oxygen...