Why may a transplanted organ be rejected by the immune system?
A) The organ contains different T cells.
B) The organ contains different blood antigens.
C) The organ contains different B cells.
D) The immune system produces a severe allergic response.
E) The organ has non-self surface recognition molecules.
Answer: E
You might also like to view...
The human population is expected to double in about ________ years.
A. 60 B. 15 C. 25 D. 91
Which of the following is a nitrogen-fixing bacterium that forms associations with the roots of plants?
A) anaerobic Bacillus species B) Clostridium species C) Rhizobium species D) Azotobacter species E) cyanobacteria
B cells are not phagocytic.
True or false
Which of the following is not true of the reactions that methylate the 5' end of the primary mRNA transcripts?
A. The reaction occurs after the entire transcript is synthesized. B. The methyl groups are derived from S-adenosylmethionine. C. The enzymes that catalyze the reactions are guanylyltransferases. D. The enzymes that catalyze the reactions are associated with the C-terminal domain of RNA polymerase II.