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

Biology & Microbiology

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The super continent _____ included the landmasses that are currently found in the southern hemisphere

a. Antarctica b. Pangea c. Eurasia d. Caprica e. Gondwana

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Which of the following are NOT heterotrophs?

a. primary carnivores b. herbivores c. secondary carnivores d. decomposers e. all of these are heterotrophs

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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

Biology & Microbiology