Q- A patient represents to the ER with anaphylactic shock. Epinephrine is given to the patient. Which one of the following adrenoreceptors mainly mediates bronchial muscle relaxation?
A- Alpha-1 receptor
B- Alpha-2 receptor
C- Beta-1 receptor
D- Beta-2 receptor
Q- Folic acid is given to pregnant women to decrease the risk of having a fetus with a neural tube defect. This treatment is a cofactor of which one of the following processes?
A- Active electron transport
B- Biosynthesis of nucleotides
D- Triglyceride lipolysis
Q- Gentamicin is added to penicillin in the treatment of infections caused by viridans streptococci. Which of the following is the mechanism of action of this antibiotic?
A- Binding to the 30S subunit of bacterial ribosome
B- Blocking the attachment of charged tRNA at the P site peptide chain
C- Inhibiting synthesis of the peptidoglycan layer of the bacterial cell wall
D- Inhibiting type II topoisomerase (DNA gyrase)