Which statement about human population growth is true?
A) Human population size on Earth today is no longer changing and has effectively reached equilibrium.
B) Demographic transition is a transition from high birth rates and high death rates to low birth rates and low death rates.
C) During a demographic transition, birth rates typically drop first due to the availability of reliable contraception.
D) Human population size has increased faster and faster throughout human history.
Answer: B
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Scientists have been able to clone
a. sheep. b. cats. c. rabbits. d. pigs. e. all of these.
Which of the following phrases reflects an effective treatment of biofilms?
A. Interrupt quorum-sensing pathways, preventing signaling between cells B. Pre-treat with newly-discovered antimicrobials before exposure to established drugs C. Add DNase to the antibiotics to disrupt extracellular debris D. All of the above have been shown to enhance biofilm elimination.
Which cells form the mucus escalator?
A) type I alveolar cells B) ciliated cells C) goblet cells D) type II alveolar cells E) alveolar macrophages
You are seeking a new anti-inflammatory drug to inhibit local responses to stress and injury. Which of the following activities would you look for in a potential anti-inflammatory agent?
A) stimulates release of prostaglandins B) blocks adenylate cyclase activity C) blocks an enzyme associated with arachidonic acid production D) stimulates the activation of platelets E) increases estrogen secretion