In the 2009 H1N1 “swine flu” pandemic, the influenza virus underwent a(n) ________, which made it especially deadly. Mortality of individuals ________ than 50 years of age was MOST common
a. antigenic drift / older
b. antigenic drift / younger
c. reassortment / older
d. reassortment / younger
Answer: D
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The Soviet chemist Oparin suggested that for organic molecules to form on Earth, the atmosphere was probably rich in
A. argon. B. oxygen and water. C. hydrogen. D. oxygen. E. helium.
Which of the following might lead to the generation of several incorrect PCR products?
A) An annealing temperature that is too low B) An annealing temperature that is too high C) Performing 30 cycles of PCR D) Using the correct primers E) Including an extension step
Which of the following functions as a biological catalyst?
A) Energy-carrier molecule B) Substrate C) Enzyme D) Amino acid E) Steroid
How are the reproductive cycles of retroviruses and retrotransposons different?
a. Retrotransposons can integrate into a host chromosome. b. The retroviral genome must be reverse transcribed to DNA. c. Only retrotransposons can be passed to daughter cells following cell division. d. Retroviruses have an extracellular phase. e. Only retroviral genes are transcribed.