A partial diploid E. coli cell has this genotype LacI-s LacO-c LacZ+ LacY- / LacI+ LacO+ LacZ- LacY+. Which of the following predictions about the expression of LacZ or LacY of this E. coli strain is right? (+: wild type; -: null mutant; c: constitutive; s: super suppressor)
A) LacZ will never be expressed (or always be repressed)
B) LacZ will be constitutively expressed
C) LacY will be constitutively expressed
D) LacY will be expressed upon induction by lactose (or analogs of lactose such as IPTG)

a client has been prescribed misoprostol for the treatment of peptic ulcer disease. what is a true contraindication for this medication

Zoe decided to measure the hand length of each of her classmates. first she marked a line across each student's wrist and lined up a ruler from this mark to the top of the middle finger to measure the length. then she recorded the measurements in the table below. marla did this the same way for each classmate, and then zoe used this ruler to measure each straight line and record the data below. this data is invalid. what is the most likely reason why it is invalid? the ruler is marked in centimeters, but zoe recorded data in inches. the range of lengths is too wide, so zoe must have misread the ruler. marla’s complicated measuring procedure was overly confusing. marla could have been inconsistent while drawing outlines of fingers.

Neelaredoxin is a 15-kda protein that is a gene product common in anaerobic prokaryotes. it has superoxide-scavenging activity, and it is constitutively expressed. in addition, its expression is not further induced during its exposure to o2 or h2o2 (silva, g., et al. 2001. j. bacteriol. 183: 4413–4420). which of the following statements best describes neelaredoxin synthesis? a-neelaredoxin is produced at all times; levels are constant even when exposed to o2 or h2o2.b-neelaredoxin is produced at all times; exposure to o2 or h2o2 increases expression. c-neelaredoxin is produced at all times; exposure to o2 or h2o2 decreases or prevents expression. d-neelaredoxin is only produced when there is exposure to o2 or h2o2.