Which of the following would be the most practical treatment for agammaglobulinemia?
A. Regular transfusions of whole blood
B. Regular T cell transplants from matched donors
C. Regular B cell transplants
D. Regular shots of gamma globulin
Answer: D
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Primary endosymbioses gave rise to ________ and secondary endosymbioses gave rise to ________
A) chloroplasts in algae / chloroplasts in plants B) mitochondria in eukaryotes / chloroplasts in eukaryotes C) chloroplasts and mitochondria in plants and red and green algae / chloroplasts in other eukaryotes D) chloroplasts and mitochondria in green and red algae / chloroplasts and mitochondria in diatoms
Once an amino acid has been attached to the appropriate tRNA, the tRNA is called a(n) ________, and the amino acid is said to be ________.
Fill in the blank(s) with the appropriate word(s).
Her skin is an example of _______________
a. an innate defense mechanism b. a first line of defense against pathogens c. an adaptive mechanism d. both an innate defense mechanism and a first line of defense against pathogens
In humans, the majority of a transcription unit is composed of ____
a. exons b. introns c. promoter regions d. start codons e. regulatory elements