#Question id: 384
#Unit 1. Molecules and their Interaction Relevant to Biology
A solution was prepared by dissolving 0.02 moles of acetic acid (HOAc; pKa = 4.8) in water to give 1 liter of solution. What is the pH? To this solution was then added 0.008 moles of concentrated sodium hydroxide (NaOH). What is the new pH? (In this problem, you may ignore changes in volume due to the addition of NaOH).
#Question id: 1239
#Unit 4. Cell Communication and Cell Signaling
GTPases serve in many signal transduction pathways and the presence of GTP or GDP dictates whether the pathway is on or off, respectively. Which of the following statements is TRUE regarding guanine nucleotide exchange factors (GEF) and the role in these signaling pathways?
#Question id: 3761
#Unit 3. Fundamental Processes
Which of the following statements correctly describes the difference between ATP and the nucleotides used during DNA synthesis?
#Question id: 28077
#Unit 6. System Physiology – Plant
#Question id: 9190
#Unit 9. Diversity of Life Forms
What is the probable role of salicylic acid in the defense responses of plants?