The immune system uses which of the following mechanisms to generate antigen receptor diversity?
a. stepwise rearrangements of Ig-encoding genes
b. rearrangement of heavy- and light-chain genes in B cell development
c. somatic recombination
d. all of the above
Answer: D
You might also like to view...
During the light reaction water is oxidized to form oxygen. This process
A. yields low-energy electrons. B. yields high-energy electrons. C. is needed to replace the electron lost by P680 during the light reaction. D. yields low-energy electrons and is needed to replace the electron lost by P680 during the light reaction. E. yields high-energy electrons and is needed to replace the electron lost by P680 during the light reaction.
The super continent _____ included the landmasses that are currently found in the southern hemisphere
a. Antarctica b. Pangea c. Eurasia d. Caprica e. Gondwana
Which of the following are NOT heterotrophs?
a. primary carnivores b. herbivores c. secondary carnivores d. decomposers e. all of these are heterotrophs
What characteristic gives C3 and C4 plants their names?
A) the sequence in which the carbon-containing molecules were discovered B) the botanically assigned geographic coordinates where the plants are located C) the first stable carbon compounds that are produced during the second portion of photosynthesis D) the first carbon compounds that are produced during the light reactions of each type of plant