What mammals retain their young for a long period of development within the mother's uterus?
A. monotremes
B. placentals
C. marsupials
B. placentals
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Ligers, the offspring from the mating of a lion and a tiger, are sterile. This is an example of
(A) geographic isolation. (B) hybrid infertility. (C) gametic incompatibility. (D) mechanical incompatibility. (E) behavioral isolation
What will happen to a cyanobacterium that has its photosystem II (PSII) blocked?
A) Additional electron acceptors, such as NADP+, will be required to oxidize oxygen and overcome the lost PSII process. B) Anoxygenic photosynthesis only using photosystem I (PSI) could occur by using cyclic photophosphorylation and an alternative electron donor such as H2S. C) It will die from being unable to obtain energy for photosynthesis. D) Photons will generate excessive reactive oxygen species and the cyanobacterium will die as a consequence.
In places where the public sanitation is poor, people run the risk of getting ____
a. West Nile virus b. cholera c. SARS d. anthrax e. mononucleosis
This is the correct answer. In analyzing an outbreak of disease, the first thing is to identify the bacterial species involved. Then once you know the species you can move forward to determine if the outbreaks were all caused by the same strain. Which of the following tests can be used to help determine the species involved?
A) Phage typing B) PCR C) DNA fingerprinting D) Gram-staining