Which of the following stimulates fibroblasts to proliferate and thus heal a wound?
a. EGF
b. NGF
a. NO
d. PDGF
Ans: d. PDGF
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The serum bactericidal test (SBT) involves:
a. serial dilutions of antimicrobials in ca-tion-adjusted Mueller-Hinton broth. b. 99.9% reduction in CFU/mL, compared with the organism concentration in the original inoculum. c. using the patient's serum to detect its bacteriostatic and bactericidal activity. d. subculturing the tubes of a completed broth dilution test showing no visible growth.
‘Flavr Savr' tomatoes have been genetically engineered so that they underproduce an enzyme involved in ripening. They can later be artificially ripened by:
a. auxin b. ethylene c. auxin d. cytokinin e. gibberellin
If you wanted to kill the plants in a lake using a chemical which stops photosynthesis, to which zone should you apply the chemical?
A. littoral B. profundal C. pelagic D. benthic E. limnetic
Which statement is true of water?
a. Water molecules attract hydrophobic substances. b. Water evaporates after absorbing small amounts of heat energy. c. Water’s hydrogen atom is slightly negative. d. Water molecules are polar. e. Water’s oxygen atom is slightly positive.