The process of clonal deletion is designed to
A. slow down the primary immune response to an antigen.
B. limit the number of lymphocyte clones an individual has in order to make the system more efficient.
C. slow down the immune system in the elderly.
D. destroy clones of lymphocytes able to react to self molecules.
E. slow down the secondary immune response to an antigen.
Answer: D
You might also like to view...
It's your birthday and you splurge with a big slice of chocolate cake, heavy on the icing. Shortly afterwards, your blood glucose levels rise until an endocrine mechanism (secretion of insulin) counteracts this rise and glucose levels decline. The initial change in blood glucose and insulin response that follows is an example of:
A. physiological constancy. B. diffusion. C. homeostasis. D. positive feedback. E. lack of homeostasis.
Different chemotherapeutic drugs can do each of the following except
A) inhibit metabolic pathways required for DNA synthesis. B) chemically cross-link DNA strands. C) inhibit DNA topoisomerases required for DNA replication. D) disrupt spindle microtubules. E) Chemotherapeutic drugs can do all of the above.
Which protists form colorful multinucleate masses?
A) euglenids B) plasmodial slime molds C) cellular slime molds D) forams E) water molds
Which isolating mechanism is postzygotic?
A. hybrid sterility B. ecological isolation C. temporal isolation D. mechanical isolation E. behavioral isolation