Superantigens exert their damaging effects by
A. killing large numbers of phagocytic cells.
B. causing the massive and non-specific release of cytokines by T cells.
C. forming harmful antibody aggregates.
D. All of the choices are correct.
Answer: B
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According to our present understanding, each of the three major domains has what is known as its own universal ancestor
Indicate whether the statement is true or false.
If the age of the Earth is 4.6 billion years old, for what percentage of this time is Earth thought to have been anaerobic?
A. 0.1% B. 27% C. 44% D. 68% E. 99.3
The above map shows
A) principal maquiladora centers. B) the world's principal EPZs. C) offshore financial centers. D) headquarters of principal TNCs. E) the world's principal NICs.
Matching I. Choose the most appropriate answer for
each. 1. ___ colchicine 2. ___ deletion 3. ___ duplication 4. ___ inversion 5. ___ monosomy 6. ___ translocation 7. ___ triploidy 8. ___ trisomy A. 3n; generally sterile B. a chromosome segment is permanently transferred to a nonhomologous chromosome C. (2n – 1); a zygote deprived of a chromosome D. a repeat of a particular DNA sequence in the same chromosome or in nonhomologous ones E. (2n + 1); three chromosomes of the same kind are present in a set of chromosomes F. a piece of the chromosome is inadvertently left out during the repair process G. inhibits microtubule assembly; used in karyotyping H. a chromosome segment that has been cut out and rejoined at the same place, but backward