Under which condition will a population experience growth?
A. when N is less than K
B. when r equals zero
C. when N equals K
D. when dN/dt equals zero
E. when N equals zero
Answer: A
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Studies of the origin of life on Earth help us to consider what would be required for life elsewhere in the Universe. Which of the following is most likely to be true of extraterrestrial life?
A. Carbon will act as the backbone for organic molecules. B. Light from a nearby star will make photosynthesis possible. C. Oxygen will be used to convert energy in cells. D. Water will not be required to sustain life.
35. The influenza virus contains an RNA genome. Every year a flu vaccine is designed to protect against three different strains of the influenza virus. Why do scientists make a new vaccine each year?
A. The virus develops resistance to the vaccine. B. People change their habits each year and become susceptible to different strains of the virus. C. The virus can rapidly mutate into new strains. D. The common influenza virus can come from many species of animals, including cats and dogs. E. Our bodies develop resistance to the vaccine and it becomes less effective.
Which antibody is the main immunoglobulin in
exocrine secretions? a. IgG b. IgA c. IgD d. IgM e. IgE
The final electron acceptor at the end of the electron transport chain is ________, resulting in formation of ________.
a. CoA; acetyl-CoA b. phosphate; ATP c. pyruvate; oxygen d. oxygen; water e. hydrogen; carbon dioxide