Cell surface markers involved in immune reactions
A. are the result of genetic expression.
B. aid in cellular development.
C. receive and transmit chemical messages among other cells of the system.
D. function in recognition of self molecules.
E. All of the choices are correct.
Answer: E
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In the figure above, MPF reaches its highest concentration during this stage
A) I B) II C) III D) IV E) V
Which statement is TRUE about Streptococcus pneumoniae and the lung infection it causes?
A) Streptococcus pneumoniae can spread from the focus of infection as a bacteremia. B) Penicillin and erythromycin are the "last chance" drugs for treatment of streptococcal pneumonia. C) Infection with any strain of encapsulated virulent Streptococcus pneumoniae provides long-lasting immunity to all encapsulated virulent strains. D) Streptococcal pneumonia is not as serious as most people think; if left untreated, it usually runs its course in about a week to ten days.
Two species of antelope ground squirrels are separated by the Grand Canyon. They are hypothesized to descend from a common ancestor, populations of which were separated as the canyon formed. If this hypothesis is correct, it would be an example of:
A. allopatric speciation by dispersal. B. allopatric speciation by vicariance. C. peripatric speciation by vicariance. D. sympatric speciation by dispersal. E. sympatric speciation by vicariance.
Who proposed that the Earth's geological features formed slowly over time, creating long periods for
evolution? a. Charles Darwin b. Aristotle c. Lamarck d. Charles Lyell e. Erasmus Darwin